LEGO Wheels for Prototyping

[dddriveman]

Does anybody know where I can get LEGO Technic 20 x 30 wheel or wide silver wheels w\ out buying the $30.00 package.

[Adam Y.]

Edited found a better online store:
www.shop.lego.com (shop.lego.com)
Sorry they only have the ballon tires here.
http://www.pldstore.com/pld/catalog.cfm?dest=dir&linkon=subsection&linkid=221&secid=77