I managed to not go crazy with this, so far. I've only found 2 stores that have dvds, and didn't buy anything at the first.
Things I've passed on:
Sliders Season 3
Star Trek Original, plastic hinge case, not sure which season, it was the red one.
A Christmas Story HD-DVD (I kind of regret not getting this one)
Queer as Folk, seasons 1 and 2, boxes were incomplete and in bad shape.
Star Trek Deep Space 9, season 6
Entourage, season 3 (don't remember if it was part 1 or 2)
Married with Children, season 4 (I think)
24 Season 1, I think (I have it, whatever season it was)
Children of Men HD-DVD (case was messed up)
Hart's War HD-DVD
King Kong HD-DVD (have it)
If it wasn't a TV series or HD-DVD/Blu-Ray, I didn't pay any attention to it, so there is a bunch of stuff I didn't list, including a lot of anime at one of the stores.
The only things I picked up were Pirates of the Caribbean: At Worlds End, and Spider-Man 3, both on Blu-ray. I didn't really want Spider-Man 3, but it was $1.50 after discounts, and I just couldn't pass up a Blu-ray for $1.50.