Free: Contests & Raffles.
USGS 7.5' Topo maps, all of Washington State. Scanned paper maps. Warning, big files:http://rocky2.ess.washington.edu/data/raster/doqs/index.htmlFree, like they should be- your taxes already paid the USGS to create the data!Also, scrounge around the site; there are other interesting bits, including early 15 minute quads (≈1895 to ≈1940), some aerial photography, etc.