You;re not supposed to use silicon SPRAY since it contains petroleum which can eat up your plastic. It has been mentioned probably a billion times on this forum. I would avoid any type of silicon spray. Canadian Tire caries the Lith-Ease for $3.59. It will serve you a long time. There is also another brand called MG Chemicals which makes silicon gel and white lithium grease which can be sourced at local electronic stores. Im in Toronto, and there are 2 stores that carry MG Chemicals products- Active Electronics and Sayal Electronics. However, I dont use white lithium grease anymore, i use Tamiya ceramic grease.
For Molybdenum grease, Tamiya manufactures a nice one, but a bit expensive. You can find it at your local hobby store.