Wal Mart is the place to go. My last 2 portable grills have been from there. first was pretty big with a cooking surface of about 1/3 a typical backyard grill. second is a little smaller, about 1/4 cooking surface, but has a handy bun warmer rack. smaller one will easily cook 2 packs of brats, and warm one pack of buns.
they are not bomb proof, but hold up pretty good (currently on year 4 of second). one tip i would offer is to unscrew the adjusment valve, as it "hangs out" and catches on stuff. I screw the little propane bomb in, and then just unscrew the whole assembled fuel cell (valve and tank) from the burner tube. The adjustment valve is what gave out on my first one, so just avoid knocking it around.
Wally usually has 2-3 models in store, and I paid less than $30 each time. go get your grill on - what a great way to celebrate another swim team outing. later.