i feel ya, i want to get a HPS bulb to finish this harvest out right but im trying to find a used one for cheap
Craigslist...and I am sure you meant that you wanted an HPS light (fixture)...if you score one used, make sure you replace the bulb!!! even though they are still burning, they lose quite a bit of their actual output.
When I ordered mine, I upgraded to the AgroSun spectrum adjusted bulb, but they were out of stock...they shipped me a standard bulb for free...and the AgroSun came 2 or 3 days later
I saved the standard bulb. After about a year burning the fancy bulb 12/12, I replaced with the other bulb...the plants responded a little bit, and it was noticeably brighter.
Also I shared some clones with my ex wifes dealer dude and he grew them with a used light, that was not even firing the bulb fully...it was kind of a joke...so be careful!
IMO with as cheap as lights are at places like HTG supply...the only reason to buy used is for the hood...but you could score a working/fixable ballast at the same time!...And unless you are going vertical (no hood needed) I would say go air-cooled for sure...and factor in the blower! (good used)
Oh...one other reason to buy used is no risking UPS sharing your purchase info! And not being seen loading up the trunk at the local hydro store!