I know that Chain Reaction carries bags, and he should have some at the Blast. My first disc golf bag was a round-shaped one made by Wall City. Outer pockets on both sides as well as a zipper pocket on one end and a drink holder (1L bottle sized) on the other. You should be able to find one for 25ish. I think the most I was ever able to cram into it was 10, and it was bursting at the seams.
I'm guessing that he will have bags. I really liked the Innova Small Bag. It holds about 12 discs.
I use a small portable cooler for my discs.
Chain Reaction has bags. I had a small bag but quickly out grew it. Somethings to consider is space for beverages, snacks, do you need room for extra towels, coat, hat and stuff. I use a Gateway tour bag, the smaller one and carry 8-12 disc. I have just seen the new PDGA bags and Gorilla bags and feel that they are very well constructed. I have had the gateway bag for 4 years and have only upgraded the shoulder straps. My first innova bag lasted 2 years before it shredded.
My first bag was from Lightning Discs. It was the smalle one not sure on the exact model though, I payed 19 dollars for it in Crystal Lake at the shell by Lippold. Anyways it has a 1L drink holder two putter pockets on the outside(I used one for a putter the other for keys and such), a towel clip, and inside it had two dividers(for three spaces total). You could fit about 6-9 discs inside plus the two pockets on the outside, all for 20 bucks. My biggest complaint with this bag though is the shoulder strap, not the strap but the pad, it acctually tore off. For the money though I think it was a good bag.
Heres a picture. (//%22http://www.lightninggolfdiscs.com/Bags.html%22) It's the bag in the upper right hand corner.