So glad I read this forum before ordering from gorilla seed bank. Even though most complaints seem to stem from paying with cash or money order, the fact that anyone has to hunt 'the gorilla' down in order to get their order corrected is the definition of poor customer service imo. All the gorilla responses seem to imply that things will get better but the same issues arise year after year in this one post. My MasterCard has no problem sending payments to seed banks (though I may need to confirm via an email or text).
Regarding bitcoin for one-time payments, STAY AWAY. Unless you've got a mining rig, you are just a patsy for this volatile currency. Now if your willing to play the odds, bitcoins can pay off, but in my experience the cost of bit coins turns out to be more than paying with cc or cash even after said discount (if they even decide to honor the discount).
Bottom line, if you're willing to chance the poor customer service displayed in this thread then suck it up and put that payment on your MasterCard (hopefully Gorilla has decided to pay the fees to allow us cc payments by now). After all... no one else really gives a shit what you spend your money on (despite what your paranoia tells you).