we use these alliance rubber bands for our catapult for VRC and I would highly suggest them, they are the highest quality yet the cheapest rubber bands i have found. If this tells you how much i recommend them, id say that the saying of "Fast, good, or cheap – pick two.” is completely disproven by these rubber bands.
edit:we use these ones specifically, but id assume all the bands from this company will be high quality (they do contain latex, we bought these because natural rubber rubber bands are better than the non latex, and no one in our org has an allergy to latex
I’m a little late to the game, but we have used the Alliance Non-Latex rubber bands almost exclusively for the better part of 5 years, and they are excellent. During that time, we tried other types/brands when recommended by other teams, and we have never been as satisfied with the quality.