I was at the junkyard today searching for parts and found a nice sanden 708 so I picked it up for $30.00 to use as my edc. Valves and rear bags are on their way and I still need a tank of two so it will probably be a couple weeks until everything is up and running. I came across acouple 508's and another 708 but I think from reading that the 708 puts out more air than the 508.