If you like Huggies, the cheapest place to buy them is Costco. Watch for coupons and stock up while you can - we get the coupon from my Mom and Dad and our neighbors so we can take advantage of the savings. The Kirkland Signature diapers are made by Kimberly-Clark - the same company that makes Huggies. They are similar to the premium Huggies, but in my opinion they run a little smaller than the Huggies. If you are a Costco member, you can call a number on the diaper box and request a sample to try before you buy. Also, the box of Kirkland diapers is cheaper than the Huggies, but the cost per diaper is more in the larger sizes, so you want to make sure that you are buying what you like and also factor in that the cost per diaper is really what matters.
We've tried a bunch of the alternative diapers and have found that they really aren't a better value when you are having to change diapers and clothes more frequently because of leaks and diapers that just don't hold that much.
Good luck!