This gal has some right here on the forum. $15.95 shipped, I've got one on the way, have purchased from her twice before this. Fast shipping and good communication.
I liked the smok omni tester but I don't like that it is only shows 2 numbers instead of 3 but it is my go to for testing everything I build on and even testing mods voltage and voltage under load just wish it was 3 position instead of 2.