Mase, that ass'y. is ~$50 from HDL. If you built one you'd probably have nearly as much invested by the time you bought the parts and tubing. But in case you want to build your own, I'd go to a pet shop and check out their collection of tubing and valves, etc., used on fish tanks.
I have many may feet of vacuum hose that I used for my other cars and its super cheap. Its the little 6 into 1 manifold that I am looking for.
Check with Pinwall cycle parts, they part a lot of Valks.