Transfer $200? If you mean what is the safest way to get the $200 from the buyer I would suggest via mail to a P.O. box, bank transfer, gift cards.
When someone mails you the cash you just deposit it in the bank. Bank transfers are 100% flawless yes. It would have to be someone with the same UK bank you use, and the money would be directly deposited into your account.
Yep, just expect to pay a bit more to send/recieve due to a fee. The advantages are that there is no chargeback and it is cash in hand.
As mentioned above by stringcheese, this is probably the safest way. Although you and the buyer would exchange full names and location, just to send and pick up the money, you're safe once it's in your hands. Another alternative, just like Western Union, is MoneyGram. Fees and conversion rate are different, and sometimes better (almost always for me, but that's because of my location). The only downside to this is who pays the fees? The fees, I believe, are around $40.
If you sell to a UK buyer then you can use UK Bank Transfer, it is free and instant to do. All you need to give to the buyer is your Account Number and Sort Code and they can transfer the money free online in seconds. Its how I sell RSGP and its 100 percent safe and even if the buyer tried to chargeback your bank covers you anyway.