Yeah, continue to browse craigslist for a used bike or try a bike co-op. Depending on terrain, length, weather conditions you'll need to tailor your ride to your needs. There are plenty of mechanics at co-ops that will help you make a good selection and advise you about add-ons like rack, panniers, took-kit, frame-pump, headlight, tailight(s). Extra tubes and a patch-kit as well. Year-round commuting requires attention to clothing concerns. Bicycle commuting is almost a lifestyle choice. Selecting a ride is just the beginning, but there're plenty of people who'll help guide you into a satisfying and healthy commuting experience. Good luck. Post back w/questions.