I belong to an only 3 year old MQG. Last fall we had an in meeting 'sale', we filled the hall with tables and each person with something to sell had it with an envelope with their name and the price. One envelope per item. A few items were free.
Each buyer put cash in the envelope, turned it into a central cash desk and took the product. It was an honour system.
There was a huge variety of things ranging from fabric, to books to orphan blocks, tools, notions, thread, kits and much more. Definitely something for everyone.
I bought batiks, I paid $5.00 per metre for fabric that locally could cost between $15 and $22 per metre. I was happy with the price and product.
Each seller priced their own items, but more were priced to sell.
I was not selling.