Although the Q&A section indicates 3 or 4 different payment methods, both times I ordered, G** told me I could only pay by Money Order and it could only be sent by UPS, DHL or UPS, he said he wouldn't accept payment sent by USPS, don't know why.

It cost around 50 bucks to 2 day the MO to them, using UPS.
I don't think UPS or Fedex has an overnight international delivery option, at least to South America.