There's a 99%+ probability (a number i pulled out of my ass) that you will not be able to find mimosa locally (unless it naturally grows in your area), and headshops would definitely not have it. Best, and cheapest place to buy it is through online. Also, its better that way, because then you don't attract unwanted attention. Jimjam Shop is my favorite (cheap and high quality).

You may be able to find (if you're super lucky) Caapi Vine at a botanical nursery, if there's one near you (but i doubt it)..so online is the way to go mcr.

And welcome to Nexus:d