And I'm just happy when I don't get coins, or 10, 20 and 50 disintegrating peso notes. My rounding errors now are to the nearest 100 or 500, and the drivers seem quite happy and surprised with the extra. When someone is driving in ridiculous traffic to get me say from San Telmo to Villa Crespo for about $2000 ($5 and change for a half hour plus ride), and the driver generally knows where he's going, it is the least I can do, which amounts to rounding up to the nearest quarter-ish, or dollar and some cents.

As for the small notes, I take them into the Rapipago type place nearby and put the money onto my SUBE card. The notes would never work in the Sube machines (and many won't take the smaller notes anyway).