Thanks Pete, that's awesome info.

Do your shipping services really double the costs for a heavier parcel?
Our shipping services charge based on weight or size of parcel, but the bulk of the cost is in the initial shipping fee. So if I send two items separately, they are charged individually, but if I package everything into one box, the cost is higher, but not usually double or equivalent to sending the item separately.

I emailed 3 people so far that have S3's for sale, one has replied quoting me:

sea mail $70 around 5 to 6 weeks ETA
air mail $140 5 to 6 day's ETA

I'm encouraged by the prices, because he seems to be in the right ball park and the fact that he's quoted is a good sign because I guess he's happy to ship, I guess his rates might be lower if he sends a lot stuff, a bit like me having an account with parcel force in the UK.