They’re running out of most of the 128GB options, especially the Space Gray. Rose seems to be the least popular color, as it’s still well represented by all carrier options and capacities.
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Despite the seemingly large inventory, they’re going fast. Still a very popular phone despite its aging hardware. Apple would have had no problem selling these for full price had they left them in the stores, instead of pulling them from the shelves. If they hadn’t been sitting on them for 5 months, and wanted to clear them out of inventory for whatever reason, they would likely have no problem eventually selling them all for full price.
While they are unlocked for use with any SIM, it’s not a bad idea to get the model associated with your current carrier especially if it’s a backup, as it may save you a trip to the phone store in the event of loss or theft.