Try cape air. They hire F/Os with low time, however you need to be very current on your instrument skills and need to pass the same level of training as their captains. Pay kinda sucks, and they only need f/os when the weather is ifr and the captain has less than 100 hours time in the 402 or when the autopilot is inop, but if they like you they'll use you whenever, but if they have a full load of pax, you get bumped off. Once you get 1200 hours you can do the mail runs, then 1500 hours, they'll help you get atp and you'll fly as captain on the 402. Your kinda limited with those hours. They don't do VFR 135.