Nice haul! I have the Caddy and '67 Camaro from that GM 5-pack. Both of them were thrift finds, and I have a somewhat odd story from when I found them: they had been placed in a bag with a foam alphabet puzzle. The cars were in great shape, though. Paid $1.50 for the whole bag, and gave the puzzle to a friend's daughter.
Unfortuantely anything from Krogers or grocery stores that are afiliated with them, I won't find because none of the chains here are part of the Kroger family.
I have the GM 5 pack, I like it, I just wish the Hummer was replaced with another GM product.