Most universities have an autoclaving department and if you ask around, you'll likely find one that'll help you out. Some openly take outside work for a fee.
Also try your local piercer. If you ask nicely and offer to pay them, they might run your gear for you.
Don't want to be social? The Thought Emporium will be opening an autoclaving service for grinders soon and this page will be updated as soon as the service becomes available.