Try eBay or local craigslist, not to mention join a local FB group - I see tons of equipment locally - but I’m not interested in wearing other ppls dirty underwear!
My theory on used products is to buy new unless you can work a deal for less than 70% of the retail cost, and seemingly in perfect condition.
Find many great new & used options and get the best deals for Neptune Apex Systems DOS (Dosing Pump) at the best online prices at eBay! Free shipping for many products!