Really? I thought the Blaine Super Rink (home of the USA women's national team) at the National Sports Center was the only place with 8 sheets under one roof. It's been there for 30 years. I guess I learn something every day! Pure Hockey is near the Super Rink as well as the famous Lettermen Sports. Pure Hockey had Prosharp sharpeners, I assume they have Sparx now. Lettermen's has a few Sparx.
https://www.nscsports.org/indoor-facilities
NSC is a crazy place on over 600 acres. It's so massive with so much going on I know people who have been there for numerous events that have no idea there's even a 300,000 sq ft ice facility on the site! There's the hockey rinks, PGA Tour designed 18 hole golf course, 52 soccer fields, 5500 seat stadium, and a 450' long dome. Until 2020 there was a full size wooden velodrome.