Edit: This company has a minimum order of 10 pieces per item. So for one simple connection you would need 20 items. Even at $1.20 a set you'd pay $12 plus shipping. If anyone wanted to go in on a group buy I'd do it.
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I found another source of Quick Connects that has built in valving - when you disconnect the flow is stopped.

They have basic Twist-and-Lock Open Flow connectors as well.

One downside of all these connectors is that the hose barb has a "lock-on" style shoulder - once the hose goes on it is permanent. If you want to remove it, you have to cut it off.

Here is a Kent Systems,Collection 4 sampling:

Basic connectors are under $1. Valves are under $3. Be sure to specify the Hose ID - typically 1/4".

Edited by greg23 on 11/11/2010 12:33:41 MST.

You can find these on McMaster Carr too.

http://www.mcmaster.com/#