No. That’s not the way Trademe is set up to work. Sellers are restricted form giving out contact details so there is no practical way of arranging such a deal though the auction process. If you want to ‘Try before you Buy’ I suggest going to a retail outlet rather than an auction website.
On very rare occasions I will offer a refund if the buyer is not satisfied but this will only apply if there is not a sound sample available and I have agreed to your request in advance. Postage is not covered.
In all other circumstances all sales are final.