I bought a pair of these from a local boutique shop but I have seen them soon afterwards stocked at PetSmart. The only difference was the PetSmart version seemed more cheaply made and more plastic-y but the same brand.
Pet Supplies & Pet Products: Doggles : Goggles for Dogs
I paid about the same price as what's on the actual doggles site. So ordering direct might work out for you? Didn't check on their shipping rates but it seems they're based in California.