Oslo to Bodo with SAS or Nowegian Airlines.
Bodo to Svolvaer with Wideroe Airlines - 20 min flight.
(Warning: max 23 kg, overweight = 50 Nkr/kilo and 180 Nkr/rod tube).
Oslo to Eveness (Harstad, Narvik). Take bus to Guliesfjord or bus to Sortland and change for svolvaer.
If you have fish to take back with you, you can catch the fast ferry (hurtigboat) from Svolvaer to Bodo. It will save you money with the weightcost on the flight. (they charge kronor/kilo).