As far as I know the actual hose on its own is not available, but you can buy spare hoses with fittings already attached. Ozone, Core, Duotone, North all sell spare pump hoses.
Available here www.kitepower.com.au/collections/pumps
Temu wins again! 
Or check your local opshop but not the fashion or city type ones
Or I can post you one for free in about a month...
Or Ali express is the winner it seems...
Make sure you get some of those nice 'rounded off' cable ties too that don't damage the canopy
