If your careful you'll be fine. Thing to look for are always the obvious ones - feedback, is it not just high, but good as well? Payment method - always use Paypal for international transactions, if they ask for anything else don't pay them. Was the photo used their own or a website rip? Do they make the effort to at least be understandable & polite in their communication? (If an accounts been hacked and its some d*ckhead in whatever random country, odds are they can't speak much english and won't be very helpful).
Insured postage from the UK is a bit pricey compared to regular airmail at times, but always get it insured. That way if you get any trouble you can tell Paypal you paid for insured postage which rules out it going missing in the post, and even if it does its the sellers job to refund you anyway.
Asking a member on here to purchase one then forward it on would work well if you trust the person with your money. Again be careful, and use Paypal for your protection. Just because joe blogs plays LFS and posts on this forum doesn't mean they won't try to rip you off once money gets involved. I've both brought & sold many things with some members of this forum and its worked out great, but you never know.