This is one of my favorite map sites:

NLS topographic maps covering all Finnish regions are available at Citizen's MapSite. This service is universally accessible and free of charge.

URLS look like these:
http://kansalaisen.karttapaikka.fi/k...urenna&lang=FI
http://kansalaisen.karttapaikka.fi/k...urenna&lang=FI

Are they gettable I wonder? I've been ripping them manually and stitching them together for my forest trips. Very nice with a very accurate map.