There is only one place. Apple.What are some good places to purchase a refurbished iMac?
Here's one big difference in buying used (which those are) vs Apple refurbished, and one of many reasons I wouldn't trust others:They may not be "official" refurbs, but I've seen plenty of them at Microcenter. Full line up of "pre-owned" - their term for refurbished at http://www.microcenter.com/search/search_results.phtml?N=4294967291+4294966363
I've bought several of them for non-profits that couldn't afford more than $500-600 investment, and everyone's been VERY happy.
Apple Certified Refurbished Products:Manufacturer Warranty
Parts 90 days
Labor 90 days
All Apple Certified Refurbished Products are covered by Apple's One-Year Limited Warranty. For extended coverage, you have the option of purchasing the AppleCare Protection Plan with your Apple Certified Refurbished Product.
Here's one big difference in buying used (which those are) vs Apple refurbished, and one of many reasons I wouldn't trust others:
Microcenter "refurbs" (used)
Apple Certified Refurbished Products: