The best day I ever had in locating used aquarium supplies came when I was a teenager. I called the local radio program "Swap Shop" to try to locate aquariums. Someone responded, and sold me a couple of tanks and all the supplies I could want for five dollars. I should try to figure out who in Dallas runs one of those radio "swap" programs. I could put on my best theatrical voice, and intone "ummm....thanks for, uh, taking my call. I'm looking for....a good, used, aquarium.....and um, you know, in 5, 10, 20 or 30 gallons, and....um....accessories....yeah, I guess, that's it....and the number to call is GU 5-1111", except, sadly, they got rid of those letters at the beginning of phone numbers and put numbers in instead.
Do you remember the phone number from when you were a kid? Mine was 501-353-2422.