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15". Call it £600 ;)
Seriously though - I've only seen these sell on eBay for what I thought was stupid cheap or not sell at all - so I'm not sure what a good price is. I bought it for £1000 in 2014 and it hasn't missed a beat really - other than the whole logic board thing, but that was a known fault that was repaired FOC by a certified Apple dealer. I'd be keen to sell on here, though.
13"? if so I may be interested at that price.