Is the book value on these cards correct?:

03-04 Bowman Signature Edition Encased GU AU #'d 0723/1250 Steve Blake BV: $15.00

03-04 sp signatures auto Chris Kaman BV: $15.00

03-04 UD Black Diamond 24 Karat Signatures #MS Mike Sweetney BV: $20.00

Thanks for your help.