I still have a stack of proofs to sell! These are the proofs for the final prints I sell. They're 12 x 18" images on glossy paper with the same high quality inks as the finals (archival, lasting 98 years under glass). The color may be a little different than the final prints or there is a mysterious dollop of color that's not detracting, just taken out of the final image. They're signed and dated, packaged just as the others are and mailed in a flat, sturdy chipboard mailer.
Because I believe everyone needs art all around, I've decided to sell these as "Pay what you can" up to $15.