http://gallowayprecision.com/smith-and-wesson/sigma-and-sd/assembled-stainless-steel-guide-rod-for-Sigma-and-SD-VE/ $30.00 plus shipping and includes the spring of your choice.
I put a set of Traction Grips on my SD40 VE and love them. I bought mine thru Galloway Precision . http://gallowayprecision.com/smith-and-wesson/sigma-and-sd/traction-grip-overlays-for-Sigma-VE-SD-and-SD-VE/
I also put a set on my Keltec P3AT that I carry everyday and they have held up...