Well one bit of good news is that a flight from London - Oslo is £50 (BA) and Oslo - Tromsø is £25 (Braathens)...
But from Kemi (Tornio) - Helsinki - London it's £770

A lot a lot.
Buoyancy aids I'm making compulsory for the trip, a good one is no more than say £30. Your own kit I leave to you, but I expect you'll all need more things.
The canoes are about £900 each, I haven't yet looked into hiring but I guess you will not want to buy half a canoe! (we share two man canoes).
Prices go up and up... :roll:
I've a map of the expedition if anyone knows how I can post an image :?: