Bit of a pet subject here
Grape seed oil is used as a base oil by a lot of pros, it’s cheap and available from supermarkets.
You can also get some water based massage oil again for professional use from Physique.co.uk not cheap but the best I’ve used (water dispersible massage oil) no smell except a very slight hint of citrus. It also washes off with water.
For Nuru j-lube is good, it comes in powder form and you mix with water, super super slippy and goes a long way.
Last but not least Uberkinky do an inflatable double massage bed for £50 which is astonishing fun.