You can find some ready planning poker cards for print in here - http://www.agileutilities.com/products/AgileAuction/ and here http://www.agile-swiss.org/wiki/index.php/PlanningPokerCards.
For those who want to buy it, try this
- planningpoker.crisp.se
- www.planningpokercards.com
- http://www.agile42.com/cms/pages/shop/
- http://www.conchango.com/store/
Happy planning.
Nuno