most reputeable medcenters in N.Cal either stock purple clones and/or seeds, or come across them on a consistent basis. I like the ones around Santa Rosa area. Purple urkle, The Purps, Mendo Purps, Mendo Madness, Mendo Bendo, Blackberry, Purple Kush, and Purple Wizard are just a few of the strains that I've come across. I've seen them from $8.00 - $16.00 each.