I have been a webscriptions subscriber for over 7 years now. I am also a Saturn Universe member of Baen's Universe. On my Webscriptions page are a list of publishers of which Tor Books is one. The following list was copied from Baen's Webscriptions page.
Baen Books
Del Rey
Meisha Merlin
SRM Publisher
Tor Books
The links to books leads to books that can be added to a "wish list" as opposed to the shopping cart.