My secret santa listed "18% gray card foldable 12" by 12" on their wishlist, and I have a couple questions:

Can I get a decent one for under $20 (our SS limit)?

Most listings seem to list "pure white" in addition to gray in the title - does that matter?

Is this what that is?: https://www.amazon.com/Camera-Balance-Folding-Double-White/dp/B07KTNLD3M/ref=sr_1_4?s=sporting-goods&ie=UTF8&qid=1543161128&sr=8-4&keywords=18%25+gray+card+foldable+12%22+by+12%22