If you like Lee's work, here are a few more places that may interest you.

www.pooterland.com Pooters Psychedelic Shack has information about all things psychedelic.
www.whiterabbitcds.com White Rabbit Cds specializes in music from the 60's and 70's!
www.artbeat4u.com
Nemo's Utopia
Goldy McJohn's Page: One of the original members of Steppenwolfe, with music and art!
Flash Back Books
Posterdelica: buy some posters!
Fillmore Frames: Get a frame for your posters!