Take a look at Audio Classics inventory of preowned Mac gear. Terry DeWick, who is a Mac repair guru also has a website linked from his that sells used gear Terry has checked out. I bought an mc250 from an Ebay seller, had Terry review and upgrade it before shipping to me. Its been great for5 or 6 years. Probably will trade up next year. If you don't lime it you can usually sell it and recover most of your investment.