Hi DTM,

The best source for a signal mirror is from Rescue Reflectors. Doug has an excelent review of the mirrors, and he makes plastic and glass mirrors that can be made with the option of being able to float. I bought one and was highly impressed. He is a one man outfit in Texas, and doesn't take credit cards, so you will have to send him a check. A really nice guy. You can find his web site under the links section. His mirrors are more expensive than most others, but well worth it.