I find ear pieces sell well if you get a good blue version. Also I do find ship parts are a fairly consistent market at lower levels. The grade 2 parts are the best most folks will see as they level up and sell fairly well. Typically 6-6.5k a piece and the materials are easy to come by. So while not big bucks for later levels do make the leveling process easier since you can make you own upgrades and always have cash to buy anything you need from GTN.