Where do you source reliably used chillers from online or in person?

Since chillers can tend to be rather pricey depending on the unit and manufacture you are looking for, where do you find some of the better-used units that aren't just beaten apart or on their last leg for a good decent price? Do you tend to make sure that you go with an online store that might have a warranty in case it is defective, or do you tend to find those selling in the local area that you live in to pick it up from (and make sure that it's either working in person before buying it)?