Is this an Int'l/Int'l connection (most likely @ EZE)? If it is after whenever the fee starts, you may be hit up to enter Argentina whatever the Canadi>ns charge for Argentinos for a visa. PLUS sums similar to what Gaucho mentions for transit (about $120-140 outbound, $80 return). That said, even if you wanted to buy a lounge day pass, the lounges generally all suck there. If you like chips, nuts and cookies, that is about what your meal would be in the lounges. The booze, however, is free. The entire departure area is pretty pathetic. The best food is probably the vacuum-packed raw meat counter.

If it was me, I'd probably take a taxi to San Telmo, which is on the EZE-side of the city center, have some lunch, maybe take a quick ride up to Caminito (La Boca) for a little local color, and then head back to EZE - you are on the side of the city where you have the easiest highway access and least travel time to EZE. If you want an inexpensive pretty good piece of meat at a place where eating alone isn't an issue, I'd recommend El Desnivel on Defensa (in the heart of San Telmo).