Ron the Sports challenge discs are extremly tough to find.
I have the entire set of hockey with the sports challenge disc that makes up 9 hockey discs. I have them as singles and sealed packs with the record player.
The reguler double sided hockey discs are tough on there own but the sports challege Richard disc is extremly rare as it was put out in very low quantity.
I have had singles and sealed packs in my time and sold the Richard for $275 once.
Your lucky i did not see that one that sold for $50 as i would have paid much more.
The ones up on Ebay right now are priced very decent for how tough they are.
The one with Babe Ruth used to sell for $400.
Recently there was a set of hockey that sold on Classic auctions and it did real well with two sealed packs but it was missing the Richard disc.
It sold for almost $500 with the commision.