Buyers beware.!!! I tried to buy bedsheets with Bi...

Buyers beware.!!! I tried to buy bedsheets with Big Banner indicated $49.99. When checked out, I was charged $69.99. I asked why, the cashier said $49.99 is for twin size, the one I picked is Queen size... There is NO sign saying different sizes = different prices. I REJECTED THE PURCHASE. Next time when I want to shop Ikea, I will think twice if I will ever want to shop there... false advertisement/pricings.