Just hundos of beavers, mate.
I saw this at a live Q&A with Ryland Tews. After the show I went to the merch stand to get a sticker, but they were only accepting cash (I didn't have any) or PayPal (wasn't working) so Ryland gave me it for free. Lovely man.
If I can convince one other person I'll get as though I've paid him back. It's excellent stuff.