As long as the weight is 13oz or lower you should be able to send it via first class international to him cheapish. Unfortunately writing "please do not bend" on it wont matter, because its going to be sorted on conveyers, etc, with tons of other small mail and parcels. They are not required to do special handling on first class mail that cant be insured. You can try and add a thin cardboard front and back to the item, but that is about it. As long as FiftyQuid is aware of that and fine with the fact you cant get him tracking for first class mail, you should be good to go and should be able to send it to him for around $5 after packing and shipping cost.
They may have you fill out a small customs form at the post office. I have a game here that Sparky won from a raffle. When I went to see about paying for shipping online for FC International, it was requiring me to print off and attach a customs form to attach to the package. Since I don't have the clear attachment envelope things on hand that they usually use for customs forms, I'm just going to have to go down to USPS in person for this one.