Went to buy a chain for my mountain bike. Bought i...

Went to buy a chain for my mountain bike. Bought it. Was asked if I wanted them to put it on, so I said sure. Took like 60 seconds. Charged me an extra 10 dollars for a "service fee". Are you joking? I could of done it myself but the fact of charging me 10 bucks extra and not telling me until after and without any warning made me feel like I was totally swindled for an extra buck by them.