To keep people updated, there are behind-the-scenes efforts to get K-theory available from a non-subscription journal archiving service (EDIT: this one, which releases its material under a CC-BY-NC-ND license). Unfortunately this is progressing slowly. I have no firm date when this could be a reality, but one hope was to see progress by the middle of the year (though I'm not confident).
PS If one is particularly persistent and know the right people, I believe there is a complete collection of K-Theory articles out there "on the internet".
EDIT2: Given the recent developments between the Journal of K-theory editorial board and Bak, I'm a whole lot less hopeful that issues regarding K-theory will be sorted out anytime soon.