I would buy new. If an iron skillet or dutch oven isn't cured properly it can become pitted. I bought a new dutch oven recently and got the one without the little feet. Most of the new ones don't have the three feet. If it doesn't have the feet it can also be used inside a conventional oven and not only over a fire, woodstove, etc. Lodge makes a good quality dutch oven and other cast iron cooking pots and pans and they come preseasoned. The old style, with feet and the turned up lip on the lid, are better for campfires and inside woodstoves. The upturned lip on the lid holds ashes. The hot ashes heat from the top if you are cooking over a campfire. You put the dutch oven on hot coals/ashes and put hot ashes on the lid. The lip on the lid stops ashes from falling in your foot when you remove the lid. It depends on how you plan to use it but I would get one with an upturned lid for sure.
Here is a link to Lodge cast iron dutch ovens.
Lodge Dutch Oven
Thanks for the link. I see most of them are the newer models, no feet, rounded lid. But the camp models have the lids with lips. You can also buy just the lipped lids. (Say that 10 times LOL) I wonder if those would fit on the frying pans as well.