What do you want them for?
People sometimes take flaxseed oil for omega-3s. But in fact I don't think it has any DHA and EPA, which are the ones you want. We can do the conversion to some extent in our bodies, but not very well at all. Better to take fish oil/fish liver oil—or simply to eat oily fish a few times a week.
Expeller-processed flaxseed oil is OK for salads, but it is a highly unstable oil. Buy very small bottles and keep it in the fridge.