The one from Galicia (the round) and the one from Castilla & Leon. Individually numbered and made by the same people that make the ones you see on your walk. Discount is taken at check out, only by using this link.
We used BlaBlaCar successfully along the Camino when we needed rest days but still wanted to progress forward. I downloaded the BlaBlaCar app. When it came to the phone number, we used the USA cell number of one of our party, who had the cell service necessary to receive the confirmation code (I only had wifi, no cell service in Spain). I included a picture and other information (ie pilgrim from USA, age, etc) in my profile. We generally found BLaBlaCar to be convenient and inexpensive. I definitely recommend! and you do need to have a valid phone number that has cell service.