From what the internet has to say, yellow fever seems to be almost exclusively confined to people who work in the jungle wherever that mosquito lives that carries it, so I am not very paranoid about needing it for my health. I just really dont want to get my no-portuguese-speaking-ass stuck in no mans land between Brasil and some other country because I dont have the shot.
The Lonely Planet says
"A yellow-fever vaccination certificate is required for travelers who, within 3 months of arriving in Brazil (or applying for a Brasilian visa) have been in Bolivia, Colombia, Ecuador, French Guiana, Peru (and some african countries)... At most Brazilian borders and major airports there are vaccination posts where you can have the jab (free for foreigners) and get the certificate immediately. But it is wise to do this in advance."
If anybody knows about a border where I can get it (for free!) that would be great. $170 saved is $170 earned (and another 4 days added to my trip!).
I would also be up for it if anyone knew of a place in some other south american country where I might be able to get it, where it might not cost as much.
As always, thanks for posting, I really really appreciate everyone's help around here.