1. Do they sell Pokémon singles? If so, do they have a lot of commons/uncommons, or is it only higher end “display case” cards? 2. Is there a dedicated parking area?

Yes they do sell singles. It's a mix of common and high ends cards. Their selection of cards is based off of whatever a person trades in. There is no dedicated parking spots unfortunately.

1. Yes and the higher end display has a case and they have a "loose" box for them aswell I believe I didnt check. 2. The parking is for the convention center and the closest is the south side