>>1297000https://maine.craigslist.org/bik/d/portsmouth-windsor-fens-touring-bike/6807012354.htmlA sport-touring bike. Excellent for you, as it's built to handle loaded bags, so it's actually suited for your weight. Wide gears, and clearance for wider comfy road tires. Might need a bit of work, new bartape, etc, looks quite good condition. I'd turn up with 400 cash, ride, see if you like it, and make the cash offer in person. This is the best if you want to really get something good for cardio. Could be a little small.
https://maine.craigslist.org/bik/d/kittery-jamis-aurora/6836752677.htmlthis is a similiar touring bike option, although more likely a little small. There is a lot of adjustment though, you could raise the bars very high on this bike. Also worth 400 cash offer in person.
https://maine.craigslist.org/bik/d/portland-specialized-sirrus-sport/6839960364.htmlthis is quite lucky if you want a flat bar hybrid, it's a reasonably high end one.
https://maine.craigslist.org/bik/d/south-portland-kona-paddy-wagon-single/6815693253.htmldecent price on a quality bike if you want something cheap. Single speed though, so better for cruising on the flat than real cardio.
https://maine.craigslist.org/bik/d/schwinn-frontier-mountain-bike/6812337021.htmlgreat value. You really don't need to spend more than this to get something good. Especially if you put some wide slick road tires on it.
https://maine.craigslist.org/bik/d/westbrook-shogun-tangaloy-100-bicycle/6786355539.htmlmeme option. Ask them to measure from the ground to the top tube, and then measure your leg innerseam and see if you can even stand over it. It's huge. It's quite a low end bike, but not bad, and the position would be comfy and upright. Honestly for $50, it's a great option. Most likely to fuck the wheels under your girth though.