You should be able to find the warm white balance cards at http://www.warmcards.com but their web page isn't loading as of 4-10-2004, 1am. So, look here: http://www.markertek.com/SearchProduct.asp?off=0

Or, just do a search on Google for "warm cards"

Just found a better price here: http://shopping.netsuite.com/s.nl/c.ACCT1441/sc.2/category.35/it.A/id.2304/.f

Have fun.

Sean