What about sites that acts as third party services for payments? Is there any site that offers that?
Do you mean paxful? You can buy amazon gift cards with bitcoin there.
https://paxful.com/buy-bitcoin/amazon-gift-cardI guess there is a place or shop that has that stuff of bitcoin and altcoins, but i really don't know for now, but there is a thread here that offers a bitcoin t-shirts...i think you can try in the trading discussion.
There are a lot of them but they aren't exposed nor advertised but if you'll search them one by one you can find many of them.