You don't have to use Paypal to purchase Prototype merchandise. Just follow the link below for the printable order form to send in payment by snail mail:
Just print out the form and check which items you want to buy. Then add $3 US to the shipping total (for international shipping) and include payment. You can send cash (in US dollars) or an international postal money order (also in US dollars) with your order. The address to send it to is on the bottom of the form.
I hope this info helps!