You can save scum vendors, the gear pieces they sell will stay the same but the stats will change. So if theres some new boots that are a big armor upgrade but you really wish they boosted Pyrokinetic instead of Aerothurge then when you reload your save (you do quicksave before you talk to people every time right, not just me?) it might be just the item you want. Or you can sit there reloading compulsively until every item they sell is a perfect upgrade. Whatever makes you happy my brothers.