Purchased Fake Pokemon Cards At Local Toy Shop.

Hello, I just purchased pokemon cards under the impression they were real. They were being sold at $5 a pack which is reasonable for the packs that I bought. I opened one and immediately knew they were fake. The store owner I called at first tried to say to say it’s normal then reiterated that yes they were fake and that they were from China. Nothing in the display alluded to them being fake. She exclaimed that we were suppose to know they were fake based off looking at them but here was no way for me to tell. I asked for a refund and they refused saying all sales are final.

Can I do anything?