A small number of Solana collections hold physical trading cards and other physical collectibles, and those collections price items in USDC on Solana rather than in SOL.
The item page always shows the currency a listing uses, so check it before you purchase.
Hold USDC on Solana in the wallet you connect to purchase one of these items.
Keep a small amount of SOL in that wallet as well. The item price is in USDC, but the network fee and the refundable account deposit are paid in SOL, the same as any other Solana collection.
The currency applies to listings and offers alike, so an offer on one of these collections is made in USDC too.