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I have a nice arrangement with a local quarry. Mostly they sell their sand, gravel etc in huge truckloads. When I want some I take some bags or plastic bins in the back of my car and am told to "help yourself." No charge.
Builders sand as sold in bags in the UK is a fine smooth sand used for jobs like making mortar. I wouldn't have thought it was suitable for rooting cuttings? Added to soil it tends to clog it rather than improve drainage.The other common bagged sand for building is sharp sand, a coarser less smooth sand. There are lots of different grades available if you go to a specialist. At garden centres you may also find things like grit sand which can be very coarse indeed, you wouldn't want to be on a beach made of that stuff.