The second hand market of electronic equipments has no guarantees or warranties associated. As the manufacturer has one year warranty and most electronics are sold after two years after purchase, the used electronic equipment is two years old already and that too without any warranty.
I feel it may save a few bucks now but would disturb you and waste your time later when these cease to function.
Data Centers are very much very important for you and your clients....you don't want any problem in your work and second hand equipment will not be good for such an important task..For your customers even single minute downtime can cause them severe harm.
We have never bought second hand equipment but have you tried checking ebay. I am sure you will be able to find some very good equipment at very reasonable prices.
Depending where you live, you may be able to hunt for some commercial real estate building that may have unused data center space. search for keywords like, raised floor, generators, raised tiles. Many time's the company looking to lease the property is looking to demo the equipment anyways. that's how you beat the refurbished companies.
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