Triad offers green, double-sided, reflective house number signs to be attached to a rural mailbox or a metal post. The cost is $15 per sign. Order yours by phone or mail. Give the numbers you need and whether you want the sign to read horizontally or vertically. The sign will be delivered and installed for you. Call Triad at 1-866-426-7555 or mail us at P.O. Box 125, Belfast, ME 04915.