I've never seen any but there are plastic rounds that come in a huge variety of sizes. If you can measure the coin in milimeters, you can select the exact size you need. They cost a lot more but they are very nice.
To protect (and display) my British crowns and Imp. Russian coins I use Coin Capsules. The two clear pieces of each round capsule fit tightly together to completely protect each coin for view from either side.At my local coin store they cost $4.95 for 10.
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