I am not aware of any plant only swaps/shows but there are some local fish clubs having semi annual auctions.
The Greater Akron Aquarium Society has theirs Sunday Nov.4 2012, look for info on their website. Fish, equipment and usually a nice selection of plants are auctioned off and it is usually an all day affair.
Also the Ohio Cichlid Association is having their annual Extravaganza the weekend of Nov 16, 17, 18, 2012. The auction will be on Sunday only but many attendees will be selling various goods, fish and plants from their hotel rooms. Check the website at ohiocichlid.com
Eheim Pimpette #270
Eheim Pro II 2028; Classics Series -2215, 2217, 2260, 2262; Pro 2229 Wet/Dry