I bought some lava rock a couple of months ago at Home Depot. A 25 or 30 lb bag, about the size of a 20-lb bag of charcoal or dogfood, cost $3.99. At that price you could certainly afford to be selective about what specific pieces you wanted to use. d.d. --------------- See http://www.aka.org/AKA/subkillietalk.html to unsubscribe