Ordering direct from overseas turns into a customs mess roughly every third shipment, so most people stop once they have had an order sit in a warehouse for six weeks with nobody able to tell them why. A US based stockist carrying the same European lines solves the batch problem too, because stock rotates faster and you are not getting the end of somebody’s pallet. We order from Nail Market USA https://www.nailmarket-usa.com/ and the useful part for a studio your size is the New York warehouse, so restocks land in a couple of days rather than a fortnight. Whoever you end up with, buy two bottles of any new base first and test it on your own hands before a client sees it.