Don't know if anybody just can't live without a Thule Xpedition cargo basket AND has unlimited fund$, but here's 2 in the UK, and they appear to ship to the U.S. (One's the larger, one smaller)
http://cgi.ebay.com/ws/eBayISAPI.dll...#ht_2283wt_902
http://cgi.ebay.com/ws/eBayISAPI.dll...#ht_2283wt_902
