My Gilmour Foamaster II foam gun just came in today. It was $42 shipped from Amazon link. This thing is awesome; I love it!! It's fun to play with, and it really saves some time. I also hear that it's good for further reducing the risk of swirls and marring. I'm using DP Xtreme Foam Auto Shampoo (on sale 2 for 1 at AutoGeek), and it foams up very nicely! A video and pic...

I love foam guns!

That's pretty cool!

I've got the Wolfgang/Pinnacle version, and it too is great. So much fun to play with, and I have definitely seen a reduction in wash related swirl content.