[Phono-L] Blues Recordings

[gregory caringi]

I just got back from the MME show in Wayne, NJ.  As usual, the biggest 
business was taking place at the record tables.  A recent acquaintance has 
got me interested in old, original blues recordings, specifically records 
cut by Mississippi John Hurt, Skip James, Blind Blake, and Son House.

I found none of these at the show.  I was told that these records are 
scooped up by well-heeled record collectors before they ever hit the shows 
or even eBay.

Can anyone direct me to possible sources for these recordings?