You don't have classified ads in your area? Find a 1980s/90s steel rigid forked MTB. 26" wheels with 36 spokes. Your frame size will be 20 or 21" (in MTB parlance). There were plenty of brands with this product in that time period. 3 x 7 speed will be the gear set, with twist grip shifters, or if you're lucky, trigger shifters. V-brakes, but sometimes cantilevers. This bike is your ticket. When you find it, come back, and we'll help you fix it to your tastes.