Ah, you have come to the Dark Market, have you!
Many items to buy, items to sell, items to trade....
Always a cost, though.
Names will never be given to the buyer or seller about who the other is.
Talk to Pe Ell if you ever want an item listed.
How deals work:
1) Seller sells item to Pe Ell (or associate) for agreed on price.
2) Buyer pays Pe Ell item's cost plus whatever addition charge Pe decides on for the item.
Buyer never meets seller, and Pe Ell will never give out names.