Then I suppose you need to initiate the group buy. But still, you do not say what a good price is, but seeing GBP 150 is still steep for you, then I'll have to conclude that you are looking for a giveaway.
All S3's are from China, so I do not get that argument if (as in the ones I highlighted) the cost is palatable, and you can ROI. Seeing S3+'s are going for GBP 200 + shipping on ebay today, I struggle to think you can get a better deal (assuming it is real) than the one I posted. But hey, if you start the group-buy and it materialises, who knows?