My local Costco definitely has cut their "TV DVDs" section to half the space right now. Right now, they have tons of British TV shows. In fact, the only U.S. TV Show they have is the new Carol Burnett Lost Episodes set (with a bonus 7th disc) for $28.99--$11 cheaper than Amazon or Best Buy.
The Costcos in the Pacific Northwest have dried up also. I check in about once a week and hasn't been much for awhile. The only deal I have seen is the original Planet of the Apes 6 movie collection for $17 or $18.