Hiya Solmarshal, welcome to MFK!
Check the Buy ans sell forum here, they show up from time to time and the sellers have a stake in being reliable. Individual members also have them listed quite often, just recently there were 2 in the 10"+ range for free, you pay shipping. Once they get that size they are fairly easy to find. Believe it or not both Walmart and Petco usually carry them pretty cheaply, $5-6. Sorry about your reed fish, I use a little aquarium silicone to hold the excluder cap in place, just a spot of it, it is soft enough that I can pull the cap off when I need to but strong enough that fish don't knock it off.
Check the Buy ans sell forum here, they show up from time to time and the sellers have a stake in being reliable. Individual members also have them listed quite often, just recently there were 2 in the 10"+ range for free, you pay shipping. Once they get that size they are fairly easy to find. Believe it or not both Walmart and Petco usually carry them pretty cheaply, $5-6. Sorry about your reed fish, I use a little aquarium silicone to hold the excluder cap in place, just a spot of it, it is soft enough that I can pull the cap off when I need to but strong enough that fish don't knock it off.