Digit had them at agent001, check june/july 2005 issue.
USB pen drives prices:
64mb--> 650rs.
128 mb-->900rs
256mb -->1.6k
1gb--> 2.5-2.7k
Look these are not branded..so in case u want a branded one, it will cost more.
Also discussed here:
http://www.thinkdigit.com/forum/view...=201958#201958