Ref costs, my Model 300 I believe is $400-$500. I do believe their site indicates they are having a sale now which includes the conductive socks (I don't use them, because my insurance wouldn't cover them) for $500. I think that's a pretty good deal; the socks alone used to be a lot. My insurance paid 65%, so the investment was worth it. I believe they also provide a money back guarantee if you are not pleased. So, you may want to investigate their site a bit more.

Randy