I have 2 of the Controlmaster 20 on a dc powered layout very happy with them .I bought both of them used in the last few years. Try Ebay I see them frequently the seem to go for 100.00 to 150.00, With so many going to DCC it should be easy enough to find one. Also try the HO interchange or HO swap shop groups on Yahoo. I have purchased on both Ebay and the Yahoo groups and have had no problems.
I am looking at starting a home layout and am kinda old fashioned. I love the MRC Control Master 20's that my club uses and I have purchased one for myself but would like to have one to two more but cannot find them anywhere. I figured I would post here and see if anyone out there has a nice used one they are looking at getting rid of. If you have one let me know here or shot me an PM.
Thanks Dusty