If I would sell them for btc they would have to ship to my house, a regular order goes straight to the buyers house.
I had to hunt for your response. I think I found it, above.
First off, please allow me to clarify that I'm in no way dissing this. I'm trying to find a solution to the concern that what asked and wondering what I am missing.
With that said...
I pay you with Bitcoin. You place the order using your means of payment. You go here: https://bitcoinshirts.spreadshirt.com/shop/address
and place the order for me, checking the box that reads Choose an Alternate Delivery Address
That's how I would do it.
The only way this wouldn't work for me is if I had so many orders, I won't have time to jump through this simple hoop.
Please let me know if this helps you and for the concern that a member had.