You can still get all kinds of wire from Amazon, it's used in other industries so it's not going anywhere. For wicking, it depends on what you use. I can't see organic cotton going anywhere either. Now if you use a vape specific brand, well, that you could have a problem sourcing going forward. Or, you could do what several of us here have done and buy several lifetimes' supply of rayon from Sally's Beauty Supply if you have one of those near you.
There's lots of helpful folks in this thread:
Are you done stocking up?
It is a very long thread, started back in 2016 when the Deeming Regs were released, so I would just skip to the end of it. If you have specific things you're looking for maybe someone there can point you in the right direction.
Good luck, and welcome to ECF!