There are a few sites on here that sells things to other steemians. 

Steem shop is one like site and steem market is another.  Coinsen is an off the block chain site but what they all have in common is you can shop for things and purchase using your hard earned Steem.

I haven't used there services yet and don't know if I will as I want to hold onto my Steem but the sites are here if you are interested to take a look.

Coinsen is more like an ebay so it is not just for Steem users but for everyone.