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Hi,
Nothing wrong with refurbished CPU's as they don't wear.
I picked my ones for £120 off ebay.
Price seems ok'ish, not a great deal but not bad either.
 
I do remember a while back their were some that were several pairs available for $170 from one seller, those sold in less than 2 hours, sadly I didnt get a pair in time.

For $250 i think its respectable, that's $125 per CPU, single cpus are going for about $150+ while pairs are going for $390+

I went ahead and got a pair, I ain't going to let this one slip by.

Refurbished or Used, it's still second handed owned. You will be very lucky if you could find them brand new but it wont be for $250.
 
You will definitely notice speed improvement.
Good luck with the upgrade, I did mine after watching few youtube videos and also decided to clean it out of dust properly.
 
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