The two day metro ticket does save a few hundred yen if you plan on using the subway for 2 days in a row. Bear in mind it is not good on the 4 TOEI subway lines. The closest subway station to the PH is the TOEI Oedo line, so the pass wouldn't be good there.

You can buy a SUICA card for Y500 (refundable when you hand it in) at vending machines located at most stations.