One flat in three years? Do you know how lucky you are!?
Panaracer is usually a good brand. When something causes a flat, no brand of tube is immune.
The Bell tube I bought at Walmart was undersized, but still held air. Tough to patch because it was so small!
Last time I bought tubes, I bought Continental; they've worked well for me. Given some of the horror stories lately, you might want to buy two or three from one LBS, and go to a store that carries a different brand (or order a different brand) to buy a couple more.