Searching for Conn 24i found these used dealers

[hntjr]

Tubaexchange.com
Baltimorebrass.net
Thebrass-exchange.com
Evmnyc.com
Flemingusedinstruments.com
Riedstraviolinshop.com
Davidsinstruments.com
Johnstonbaughs.com
Davewilsonmusic.org

These dealers were obtained from the internet. None had my desired Conn 24i, so I have not pursued them any further. Use usual caution when using these websites should you fine something you desire to purchase. Have a good day.