For Concepcion, I would look at obtaining certified autographs.
Concepcion 2000 Fleer Greats of the Game:
http://www.ebay.com/itm/Big-Red-Mach...3D371530132717
There is also a red ink variation.
Since Kirby is deceased, I think prices for good specimens will be north of $30.
Cesar - The big red machine is a popular group on the autograph circuit. Cesar appears at least once a year at such an event (usually in Ohio). If time is not an issue wait for his next appearance and send the card of your choice in. Otherwise look to pay $15-$20 for a signed card.