After much searching, I was unsatisfied with the card tray holders on Thingiverse, so I designed my own in SolidWorks. They are designed around Settlers of Catan 5th Ed. copyright 2015 resource cards. These do not fit standard size bicycle playing cards.
I borrowed Walter's technique (http://www.thingiverse.com/thing:784951) for housing neodymium magnetic balls so that the trays stay together and can easily be re-arranged. This design uses 5mm dia. magnets.
Can be printed in any material. The prints shown are in ABS and PLA. Printed on a Flashforge Creator Pro using ReplicatorG.