I think Bob is referring to a Riker case. If you only have four, a small one would work well and they're inexpensive. The case may also help to keep most moisture out. Here's some pins displayed (without glass lid on)...
A word of caution about slabbing. I have approx. 350 discs (most high grade) and haven't submitted a single one for grading as I think there are times when the slabbing process actually bends the metal rim if it's not perfectly placed in the holder prior to sealing. Shown below is a Young disc (not mine) with bent rim at bottom that I believe came from the slabbing process. I have another in my collection that I bought slabbed that is similar. Although this may have happened prior to slabbing, out of the raw 340+ discs in my collection, none of them have bent rims.
