Welll... From my garter experiences, they are not easily "lured" out of places. I tried eldadevoz's idea about a year back (something that easily conducts heat in the middle of a yard, or somewhere sunny...) and in about a week, I had a few snakes under it... works VERY well!
you probably wanted something fast but... BE MORE PATIENT NOW!
Check out my friends band... The vendors! Alternative/pop-punk.