No discount but they have at least 5, and two are spoken for. Spoke to the father (not the seller) and apparently have to wait for the son (seller) to call back. May be picking up Monday. If anyone wants one and details after speaking to the son, let me know. Appreciate knowing what to look for besides obviously broken seals and such. Will ask any questions you'd like if you post them.
Here are pics of the two I got (other one is for a buddy and spoken for) in case anyone is considering it. The left (smaller) is all chrome (stainless steel?) and goes to 3000psi for input and 100psi on output. The right is half chrome and brass and goes to 3000psi and 30psi, respectively. Each has a needle valve that was thrown in for free. The stickers on the back still list the price of $151.58 each. Apparently they may need an adapter for whatever cannister and tubing diameter.
He has two left, one all brass and one 50/50 chrome/brass. He does not think he has any needle valves left. Dealt with the seller directly. Not planning on going back and so offer to pick up for others is gone, but he's a nice guy and easy to deal with. Says he got them from a government auction and they all work. I cannot test if mine works yet.