Okay . . . how about this?
http://www.homedepot.ca/product/pl-3...adaptor/913032
I'm pretty sure that's it. I passed over it the first time as I thought it went 1/4" threads --->1/2" Quick Connect, but I'm pretty sure it goes 1/2" threads --->1/4" Quick Connect.
The Country Hills Home Depot (a stones thrown from my place) seems to have a lot of this stuff in stock, so maybe I should just go wander around the store for a bit.