Hancock's of Paducah also has both, though the Bella one there is the older one with fewer colors for 19.98. I have the Kona card and a Moda Marble card. The swatches are 1" square...smaller than paint chips actually. :D It is actual fabric, however.
If you order often from any of those lines, the cards are worth getting, imo, though the dye lot can make some minor differences in the colors you actually receive when ordering.