I was at the Metro Centro office today and I wanted to get an update on costs and such of Extensions for Tourist Visas.

210 cordobas per 30 days (Maximum according to Metro Centro office is 90 day extension)

3 cordobas for the form you have to fill out

bring 1 set of copies of your passport (the front pages and all used pages)

The main Migracion office is open till 1PM, but for your convenience the office at Metro Centro is open on the weekdays from 10 AM till 6 PM. I asked them twice if they were really open till 6 PM and they said yes (only at this office). Saturday and Sundays they are open as well, but the hours are shorter.