Where should I Buy a front tire? Buenos Aires / Border with Paraguay / Brazil / USA?

[arooni]

Hey everyone:

I have a MT-60 front tire with 7,000 miles on it. Photos at bottom of the post. I'm in the USA now and am thinking which is the best option:

1) Buy the tire in the USA and fly back to Uruguay (I'm in the USA for one more month), then take the ferry back to B. Aires where my bike is located. Put tire on the back and carry it towards Igazau Falls. I can get one for $80 here in the States (Shinko 705 Radial). It costs nothing extra to check this as luggage. But would be slightly annoying lugging around a tire with me.
2) Buy a front tire in Buenos Aires and take it with me.
3) Try to buy at the border in Paraguay (I have a US passport, so not sure about to get in without paying a $160 visa fee which I don't want to pay)
4) Buy in Brazil... I've heard they are really expensive though, which doesn't make a ton of sense to me considering there is a Pirelli factory there. It's 1750 miles from Buenos Aires to Curitiba (along my route) which looks to be the first big city I'd pass.

Your thoughts?

Best,
David

Photos: