Most bang for your buck will be taking the 06.40 to BIO on Sunday morning, there is still availability in the V-class bucket (VKAMP). 802,- NOK all in, this will net you 3600 points + bonus return. Book on
www.wideroe.no and make sure you get the VKAMP fare, SAS.no doesn't specify.
Cheap and effective, but you have to get up early Sunday and you need to spend half of Sunday on an airplane in P-class. CPH or ARN is shorter of course.