I bought a Gilmour foam gun from Amazon for approx $40 a few weeks ago and just wanted to share my positive experience. It has a huge resovoir and a half dozen settings for foam distribution. Also this model has all brass connections (the other one has plastic). Great investment for the money. Only issue is the thick foam can eat a lot of soap but I think it is worth it.
http://www.amazon.com/Gilmour-75QGFM...2101921&sr=8-1