I've found a terrific source for just about any cross-cable connector you could think of. Prices are fair, but at least you can find the stuff. They are especially strong in coax, antenna, and professional communication products.

L-Com Global Connectivity
45 Beechwood Drive
North Andover, MA 01845-1092
Telephone: 1-800-350-5266

http://www.L-com.com