Typically, a full authentic Sanrio+stickers sells for about $250-350 US dollars, average. Full WA sets depend on the region: JP sets sell for the cheapest, about $100-150 US dollars. EU sets are about $200-250 average. NA sets are typically $250-300, average.
If you're looking to sell your cards, you stand make a lot of cash!

If you want to buy...you're probably better off getting custom cards at this point, because AC cards these days are kind of expensive, depending on what you're looking for.
Personally...I'm holding out on all my cards for Animal Crossing Switch. ��