Air Mail is a crapshoot - there's probably a 50% chance that it'd arrive in time. And if it doesn't... we're basically paying $82 to NOT get Runamuck.
What's even worse, you _can't_ get a US money order here. Which leaves a USD cheque. Which will cost $20-30 to organise and a similar amount to cancel if it goes missing in the mail.
I've emailed them through their website asking if I can join via email at all. I'll post the response (if any!) here.