] This section shows the pricing obtained from
] manufacturers for tags, readers and related equipment. At
] present, purchasing inquiries should be made direct to
] the manufacturer or distributor. RFID Exchange will
] establish direct purchasing arrangements as soon as
] possible - please contact us for more information.

This guy has compiled a comprehensive list of companies offering rf-id developer kits. Some are extremely expensive. Some are really cheap, but not standards compliant. I like the Crosspoint unit the best.

RFID Exchange - Purchasing Options