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Some of these companies have been swallowed up by other related companies. I have more, but I'll have to go through the closet.
Not much for Pets.com alone, but maybe a whole failed dot com package set would work.
I also have various unopened things in cupboards from when Vitamins.com, MotherNature.com, et al, had $25 off $25. I hung out with the freebie hunters for a while. It was very lucrative...and fun! A free dvd player, free pairs of tennis shoes, hundreds of dollars in gift certificates, etc. Ah, the good ol' days.