Ideal Displays for Enamel Pins
Rather Keen pins have the option of coming with individual holes for hanging as seen in this photo from the Strand bookstore.
If your shop would prefer to display them on the counter, here are my recommendations:
I found this little crate in my Michael's wood crafts aisle. It's ideal for fitting in that small space by the register. Footprint: 3.25 x 5 inches. Holds 10 pins. If desired I'll include one of these in your first order.
This rack holds 36 pins. Footprint: 8 x 6.5 inches. I'm looking into offering these myself, but until then you can order directly from ClearDisplays.com. It's Small Tiered Rack (item 8323).