Updated August 6th, 2016 – TeleFinland Unlimited Monthly(20€) and Weekly(10€) data packages
Update November 24th, 2016 – DNA has upped their Data rate to 300 Mbps at the same pricing. (Graphic not updated)
By request, here is a chart of prepaid options and fees. I hope I got all the info here right, as a lot of information for prepaid plans is a bit more convoluted than their postpaid counterparts.