As others have pointed out, the postage price you enter is what you can charge..it is not an approx figure. Also as mentioned the wallets are too big to be sent as large letters.

This needs amending. Not up to the buyer to work out postage costs.

"Willing to post within Australia only, postage fee of $8.25 appx, but postage on actual via Australia Post"

Concerns me you list wallets as being designer in the title, when they aren't.

Is there a label inside the wallet that states the wallet is genuine cow leather? If so and if possible take a photo of that for the listing.