At the one where I live, they have SOME white plastics, but not very many compared to other colors. I was looking for Rage Tails in white, and they didn't have any on the shelves except for the toad. For most of the lines of soft plastics, they don't carry any white in stock.
For example, seems like they carry pumpkinseed in every line, but white in only a handful. I was looking for a white lizard, and out of the 10+ brands/models of lizards they carry, I only found 1 or 2 in white. Maybe they're available on line.