After searching in stores both online and in person, I finally found a spring-loaded coin holder that stores quarters, dimes, nickels and pennies. I believe that this is the same one that used to be available on Amazon, but no longer is. I was able to easily store 30 of each of the coins and the holder fits nicely in the cup holder. The lid of the cup holder nearly closes completely. Coins can be removed simply by sliding them out. The coin holder can be rotated in the cup holder to get any of the coins out by pulling the coins toward oneself. Alternatively, the coin holder can be easily lifted out. There is a thin adhesive pad with a plastic/vinyl base that I chose not to apply; I felt that the coin holder would be easier to rotate without the pad. The cost is $8.99 with $7.81 s/h for a total of $16.80. Pricing is a bit high with shipping for such a simple device; however, if local Prius Groups were to order them in bulk, significant shipping cost savings might be realized, e.g., shipping for three was the same as for one (although I ultimately decided to order just one).