> Bitcoins are volatile, but if you wanted $10 of bitcoins to stay $10 of bitcoins, you could make deals with people to help you do that. Bitreserve and Coinapult Locks are two products that are dedicated to making those deals. You send them $10 of bitcoins, and they’ll give you $10 of bitcoins (minus their fee) whenever you need it
Another way to do this is to keep your $10 under your mattress, or even in a bank. Both approaches have the benefit that nobody will charge you to do it. The latter, in fact, may even pay you to do it.