If something looks to good to be true......it probably is.
Regardless of your pick in Argentina or Uruguay use a US travel agent.
Times are tough, lot's of guys operating, and what once was a solid operation could be a wreck this season.
Go through Detail, or other reputable US agent and you'll be on the safe side if things take a wrong turn.

Regarding costs: A good advice for all travel is take half the clothing you were planning to take and twice the money smile