Yes, I have. PBA is a good organization. If you want to see some interesting Bukowski items, check out their upcoming auction of The Edwin Blair Collection of Beat Literature: http://www.pbagalleries.com/
[Disclaimer: I'm not affiliated with this organization.]
Is signing up free?
And I've always wondered, how do you get your own stuff to get sold that way on e-bay?
When I was selling It Catches My Heart... on e-bay, I had someone e-mail me a question "Why don't you auction these?" and I thought yeah, good idea, now what?!