It depends on how many servers you put in a rack. It's been years now I did this kind of work but I would say that an average rack with 20-25U in computing, 5-10 in storage and 5 in networking will cost you 300k$ easily. I'm pretty sure that Oxide will be more an Apple-esque experience, also on the price side, so a "normal" rack giving the same performances will be cheaper but if you want Oxide you are looking for other features beside the pure HW.