Originally Posted by Eastbay1K

WU hovers on either side of Blue, so from day to day or week to week, YCERMV.

Just a couple of caveats with WU -
Your pick-up spot may not have enough cash on hand at times; and,
Argentina has more holidays than pretty much anywhere else on earth - holidays where services like banking, etc, are closed, so make sure you don't get stuck without $ - i.e., my last trip down there had a finde XL - a 4 day long weekend.