Don't put all of the blame on the tube. It may be the tire as well. It is very unlikely you will get a blowout from a properly inflated tube in an undamaged tire unless you don't seat the tire correctly. If you manage to get part of the tube between the rim and the tire you can damage the tire bead and probably will cause the tube to rupture. Once messed up, a tire with a damaged bead will just lift off every time you replace the tube and re-inflate the tire. You can find inexpensive tough tires that are pretty flat resistant. It takes some experimentation to find one that works for you.

I recently bought a batch of 20 inch and 700C presta tubes from Niagara Cycle and chose several different brands to see if there was much difference between them. I bought Sunlite, Qtubes, and XLC. I also have boxes from Nashbar, Kenda, and Continental. The only brand stamped "Made In China" is Sunlite. All the rest are made in Taiwan. The sunlight tubes are good quality. The brand of tube that I had a problem with recently is a Kenda tube that leaked at the base of the presta valve. None has been defective coming out of the box. The most expensive tube was $3.73 (Qtubes) and the least expensive was $2.92 (Sunlight). Prices vary by the size of the tube of course. My LBS probably charges $7 for similar tubes. I wouldn't buy tubes at places like Walmart because they are so HEAVY. Most were filled with slime which I absolutely abhor. I do have to inflate the 20" tires every few days but that is preferable to using a heavy tube.