Potting Mix for cuttings

I want to ramp up my dahlia growing.
Anyway, back to the cutting mix -
Many people use half and half -peat and sharp sand mix. Any recommendations of what to buy? I don't really want peat - I don't want to spend a fortune either. Can I use builders sand as opposed to sand from the GC?

Yes Scarlet builders sand can be used but make sure that it's washed concrete sand, if you have three or four cuttings from one tuber I would suggest you try one of the cuttings in straight sand, as for the compost normally I would say use any compost but my recent experience with an average compost was bad, so go for a good quality peat free and mix 50, 50,