One ended up being a plain old hooker, one was from too far away and a little too old.  The other two I ended up meeting for lunch and sleeping with both (every other week) for a month.  Then my wife got sick and was home ALL THE TIME and I had no way to see either a SB or regular provider.  Since the wife is not very sexual to begin with (hence the hobby and SB's) and doubly less so when she isnt feeling well (gall bladder), I went from once a week to celibacy for 2 months!  Both SBs have moved on now.  
 Aaaarggggh.

Only good thing is. I am saving up cash for bacchanalia as soon as she goes back to work.  Starting as a monger before moving back to SBs (found certain providers are a notch above any amateur SB)