First, there is a price difference between the redline and normal. The only difference is the led color. The redline herpstat 1 does the exact as the herpstat 1 except in a different color. The manufacturer does have a direct sales. Go to Spyderrobotics, then at the bottom of the page in the center you will see "Buy Direct". Click that and it will give you a list. BTW it is usually cheaper on shipping to buy direct from them, at least it is when I order from them. As for used, up to you but if you do buy used, make sure it from a reputable source or if its something like Craigslist, make sure you plug it in and test it before giving cash. Oh and it looks like from their website, the price difference between the redline and normal is $10 more for the redlines.