I own SS custom, Shadetree, magnolia, Kenny Morgan, Billy Buice, and a few more. they are all wonderful scratchers, but the little ones that Spring Creek is selling are the most realistic Ive heard. He has been selling them for 23.
here is a video clip sound file. Click on picture

Here are a few others. maybe you will hear the sound you like.
Billy Buice

Shadetree

Tom Gaskins

Magnolia Gane calls

JLC