You're welcome Dan and Sandy are really cool too. I met them both this last week-end. My little one wanted to get a cave for her Lake Vic, so I handed her $40. She was really shy, but Sandy took control and showed her different shapes and colors. She ended up walking away with a Cichlid cave, a Pleco cave, two BN Plecos and $25 in change!
Clay pots are another good idea. I use them all the time. You can find some really cool ones...strawberry pots make great caves, as they're usually fairly good sized with lots of holes for fish to go in and out of.