About 3 years ago, I think. Ilan will know. Rick's backlog reached critical mass, they raised prices significantly for the first time in years, and that caused used prices to shoot way up.
Last year my son got a barely used 2007 4003 in a multi-bass trade on Talkbass. He got the Sadowsky he wanted and always intended to flip the 4003. I listed it at the Rick Resource Forum at $1400 and nobody bit. He put it on eBay at 1550 BIN with free shipping and it was sold in a few minutes.