The Minnesota Aquarium Society holds three day-long auctions each year. Local aquarists bring their bagged fish, bagged aquatic plants, tanks, and aquarium supplies. Each item is auctioned to those attending with the seller receiving a share of the selling price.
Anyone is allowed to buy and sell, however, MAS members receive better rates.
Please refer to the current auction rules, which may be change between auctions.
Seller's advance registration page: http://kkreate.com/MAS/