Got some a couple of months ago from godive at Derby and maybe I was just lucky but got a huge logbook included with my order FOC. I haven't got around to sticking them in the mask yet but from all I read on the bulletin boards its improtant to follow the instructions exactly. Aparently some people just stick a lens in one side for reading instruments and then if they lose it in the wash so to speak they have a spare. When I get around to it I will stick lens in both sides as I bought a couple of sets. Delivery was quite prompt and they have various strengths. Hope that helps.
GO-DIVE SCUBA STORE