I bought mine for $270 each from this place:$327 doesn't seem too bad of a price for new calipers, from what I can tell. Been keeping an eye out for used ones, and they seem to be $260-ish per caliper with unknown true conditions.
But I've only just lightly been looking for about the past month or so.
https://www.autohausaz.com/pn/PO-95B615123F
https://www.autohausaz.com/pn/PO-95B615124F
Right now they are $330, guess they went up, but when I was getting mine, they were the cheapest. I do remember Sunset Porsche offering them for like 290.