Clincher Tubes

I buy tubes & tires from probikekit.com, they periodically have pretty great deals when you buy several at a time.

For CO2, I do a bulk order from Amazon every few years and get them for around $1.00 a piece. You typically have to by 30 or 50 to get them that cheap, but they don't go bad.

I stock up when they are on sale at LBS. They go on sale now and then 3 for $12

I think a bigger question is why so many flats in the first place. To me it sounds like you have something going wrong with your rim tape, tube installation, PSI etc.

I agree, it's a lot of flats. First one was a spoke broke and punctured the tube. Replaced that one (and the spoke) with a crappy slime filled one that was I think 3 years old. Got about 25 miles on it before it popped, found out I pinched it when I put it on. Put another one of the crappy slime filled ones on (it's what I had), may have over inflated that one and had it explode before I even got it on the bike :D. The last 2 have been similar instances where I was trapped and couldn't move out of the way of a road hazard safely. The other thing to mention is these have all been on 2 different bikes, and not always the same tire. The last two were on fronts while the first 3 were one rear. I have checked tape and tires to insure there are no issues with them.