M.G.
Don't buy a cheap one. Be patient and watch Craigslist. A BoB stroller is great. I traded mine in for a Dreamer design, bc it was more compact and a little lighter. Just shop as if you're in the market - figure out what you want and then buy used.
Also, I strongly encourage you to start jogging without a stroller and 2 kids! It's a whole different experience and level of intensity. I personally decided that running is for me and not fun shoving an extra 70+ pounds!
Good luck.