Cash is yer only man.
Anything else can be forged. Well, even cash can too, but circulating €8K of forged cash is enough to get the Gardai heated up so that's not a likely move. Giving someone a forgery that looks like a cheque or bank draft won't cause as much of a stir.
Do not accept a cheque, there is absolutely no chance of a come back if the person has insufficient funds when the cheque is cleared.
If the person claims they cannot get cash (or it's too risky to carry) then insist on accompanying them to *their* bank and get them to authorise a funds transfer to your account. Even then they can still cancel the transfer. If you are in the branch it is then just as easy to get them to have a draft made out to you and you are covered then - the bank *will not* give the account holder a draft unless their is money in their account, and once it is made out and in your possession neither the bank or the buyer can cancel it.
It is a different story if they turn up with a draft in their hand - it could be stolen in which case you more than likely have no comeback. If the draft is made out in a branch in front of you then it is good as gold.
z