Is maxx race cards still in business?

No. The original founder and owner of Maxx, Jim McCulloch, sold the company in 1991. The new owners ran the company poorly, and were soon forced to declare bankruptcy in the mid 90's. Uppper Deck bought the Maxx name and remaining inventory in a bankruptcy sale. Upper Deck did produce a few more sets under the Maxx Race Card name until 2000 when they stopped making Maxx cards. No more have been produced since then.