Not sure what you mean by commerce corner - a place where individuals can buy/sell/trade spirits amongst themselves? Again, the limitations are largely governed by shipping laws, which are a nightmare to navigate. Moreover, the laws in my state (VA) don't allow me to ship any alcoholic beverages to others.
Your best bet would be to find, or create, such a group locally where you can exchange the bottles in person.
I think someone here (JMF? Evergreen Dan?) has hosted parties where folks split up and share bottles of sparsely used, rare, or weird spirits (say pine needle eau de vies, Galliano or amaros) to defray the cost of trying new and unusual drinks.