Living in rural Norway this was never an option. Normal stuff was accessible (and in shops with qualified staff) but anything special was only available if a distributor had it.

EBay, Etsy, Ali Express and amazon (however much I despise their business practice) makes stuff available. A few examples.

• Pluck foam is impossible to find outside specialized commercial vendors that want to sell it by the ton or something
• Small vortex mixer that is not sold by ThermoFischer for an insany jacked up prize. 3mm rubber mat that apparently you get cut to measure in Home Depot according to the craft YT channel cannot be found outside companies selling them as health and safety mats to cushion walking surface… Guess if they are cheap.