I just bought an sp101 last saturday and picked up a cheapy thin leather clip on for 10 bucks. I know it won't last as long as a quality one, but it works fine for deep concealment. I will eventually replace it, but the price was right.
The only negative is that the retention is good, almost too good.
I carry a Glock 19 in a Low Rider, often under just a dark t-shirt or print, button shirt untucked. Getting ready to order on for the 101. Jeff's great to deal with. Give him a call. Last time I talked to him, a well-known instructor had ordered a bunch of stuff 'cause he'd heard so many good comments on the holsters. Mine is actually my second; I wore out the first one taking it off and on about a bazillion times. Present one's 2-yrs old or more.