I bought my tickets yesterday at the TickeTek location on Santa Fe between Plaza Italia & The Palermo Subte station.
TickeTek: 10am-8pm
Av. Santa Fe 4389
5237-7200
I went by the actual polo grounds first and it turned out that only players could go by and buy their tickets on the grounds. There's lots of building going on right now for this weekend.
The Abono is AR$220 and the individual tickets are AR$30. There are 7 dates, that would mean AR$210 to buy them individually. However, they do have a AR$25 rape charge on each individual purchase. I don't mean TRANSACTION, I mean PURCHASED item.
I bought 3 abonos and had to pay AR$75 in rape charges. (rape charges = "convenience fees") So if you buy individual tickets, it might be AR$210 + AR$175 (for charges).
Just an FYI.