This is a tough one! I'm sort of in the same boat. I'd suggest "Financial Peace University" like another person did below (but I haven't succeeded in getting my husband to go to it yet -- still hoping, though!). One thing I've done that has helped a little (although my husband didn't have a great attitude about it), was to keep track of our expenses, and put his income at the top of the page, and then list all of our typical expenses (mortgage, utilities, insurance, gasoline, food, etc.), and show that at the bottom of the list, there was no money left over, we were over-spending, or we had maybe $5-20. He didn't like it, but it did help his "I make the money, I can spend the money" attitude a bit. [He never did *too* much, but even small expenditures add up over time, or the occasional computer component would bust the budget.]
Check your attitude, as well -- are you acting resentful towards your husband because you "have to" buy your child's clothes on eBay, or you "can't" get your hair cut like you'd like? See, I'm frugal, so my attitude towards buying clothes from yard sales & thrift stores is more of excitement because I know I'm getting a great bargain, spending less on one year's worth of clothes than many moms spend on just an outfit or two; but if you "heave a sigh and wipe your eye" as you tell (complain to) your husband just exactly what all you've had to scrimp and pinch and pass by so that **he** could get his thingamabob, then he's not going to hear you -- he's going to get defensive. [I'm not saying you're doing this, because I don't know you; but if you are, then you might need to alter this.]
He may be spending in reaction to what he feels like is your way of controlling him. So if he *feels* like you're telling him what to do, and/or trying to "be his mommy" then he's not going to listen or communicate, but will clam up and ignore you -- even when you're just trying to have a normal conversation!
Take a good, close look at your expenditures for the last 3 months, and see if there are areas you can trim that *you* control (there may not be, but often there is -- like eating fast food when you're out, when you could pack a sandwich; or buying a book that you could borrow from the library; or throwing out food that could be used for leftovers). You *might* find that there is more money than you realize, and cutting $5 here or $20 there could add up to a very nice haircut. :-) But as you look at your past expenses, formulate a "typical" budget based on how much your fixed expenses (mortgage, insurance) and normal, variable expenses (utilities, gasoline, groceries, toilet paper) are, and when you're done, reduce the categories as much as possible (put your phone, cell phone, electricity, gas, and water together under "utilities") so your husband doesn't get overwhelmed by a 5-page presentation. Then, sit down with your husband, and say, Ok, we make (not "you", but "we" -- you're equal partners in this) $3,000 a month, and we spend $800 on mortgage, $500 on groceries, $300 on utilities, $700 on gas, car payment & car insurance... and $100 on miscellaneous items that pop up occasionally which leaves $75 left over -- what should we do with that? Or, you could say something like, "We spend $800 on food every month, but the average family our size spends $500 on groceries a month -- how can we reduce that?" Or, "I've added up the past 3 months of expenditures and was shocked to find out that we've spent $600 on eating out! If we reduce that, then we can..."
The way I look at things, my "job" (aside from being a wife, mommy, and housekeeper) is to save money. I cook from scratch most of the time; we don't eat out often; I rarely buy clothes for myself, most of my kids' clothes are hand-me-downs from my brother's kids, what clothes I do buy are from yard sales or thrift stores; I get food from salvage stores; I make my own bread; I keep the house warm in the summer and cool in the winter -- things like that. It does add up. "The Complete Tightwad Gazette" is an awesome and amazing resource -- not only is it chock-full of tips and ideas, but it can help reset your mentality from "woe is me, I *have* to pinch pennies" to "woo-hoo, I saved five cents on bananas!" Many people wrote in to tell the author that they had gone from spending more than they took in every month, and couldn't imagine how they could spend less, to -- within a matter of days or weeks after getting the first issue of the newsletter, now compiled into book(s) -- being able to save a couple hundred dollars, and expecting to save even more the next month.
Granted, if your husband is just going to *spend* all that you save, then that doesn't help out much; but if you can save it both together, that will be helpful. In The Tightwad Gazette, one woman said that she started to "convert" her husband to frugality by casually asking him how much he had spent that day (on chips, soft drinks, etc.), and then putting that amount of money in a hidden jar. Several months later, when the husband was complaining about not having enough money to buy some gadget, she brought out the jar, told him what she had been doing, they counted it, and the husband was shocked at how much money he had frittered away. It wasn't an overnight conversion, but it did help.
But the bottom line is, you have to get your husband on board, and the best way to do that is either to make him think that it's his idea, or to "sell" him on frugality by pointing out all the good things he (and your family) could do by watching what you spend.