"oXigen for dummies" question(s)

Yes it's me, the confused slot car fanatic who has barely enough skill and knowledge to solder a SSD chip in a Scalextric car.

I have many questions but one question will do for now....
I previously understood that there would be no need to buy the "O2 lane change driver" for the straight Scalextric lane changer?

How much is the O2 lane change driver?
My track design has 8 straight lane changers and I'm worried about money and having to solder. (my budget is limited and I have many chips, controllers and a dongle to purchase)

Thank you for your time and patience Slot Car Enthusiasts

PS. I am not going to race in analogue by the way if that's relevant