I am a crusty ol' bachelor hermit type, so I don't need anything fancy or anything to put my collection on display...
I use individual razor sack-up sleeves, sack-up roll up sheaths (both available at Straight Razor Designs) or straight razor boxes / coffins.
I just took a quick look at E-bay and found 1,713 boxes currently for sale. I suggest that you include the word "Lot" in your search parameters for offers of more than one at a time.