Wanted - 70-210 D FA F4

Hi all, this is a speculative post, but if anyone is interested in selling their 70-210 F4, I am a willing buyer! I have checked online and there are a couple of new ones around at list (or close), or well priced ones in Japan - but no used stock in the UK. Equally if anyone has tips on where to look apart from eBay I'd be very grateful.