I buy mine on Amazon
https://www.amazon.com/Lubricant-Boat-Coolers-Wetsuit-Drysuit/dp/B07W6XFLT5/ref=mp_s_a_1_5?crid=PLYUWXJXF0JV&keywords=zipper+lube+for+metal+zippers&qid=1650367618&sprefix=zipper+lube+%2Caps%2C105&sr=8-5 something like this usually