Unfortunately, there were virtually no deals during BF/CM (and I would expect going into Christmas holiday season) on the whole iPhone 15 generation. Apple didn't include any of the latest iPhones in their BFCM deals, and basically Amazon and other online retailers that have great discounts for Watch/Macbooks/iPads don't for iPhone.I'm still waiting for a deal on this phone. I buy mine outright, rather than do carrier deals.
What are the people here paying for the 15 Plus 128GB ?
As you put it, the only ones who gave some discounts were carriers, and all of their deals to get a discounted phone (with a trade-in) is a bit of a game where you have to 1) upgrade to their newer / more expensive wireless plans, and 2) the discount is usually in monthly credits spread over 2 years.
The only place I saw some deals on the iPhone 15 generation was on the Chase Ultimate Rewards site (for Chase credit card users). They have a dedicated Apple section of their online store, and it's usually 1:1 points (eg. 10k points = $100). On rare occasions (and usually during the month of Nov), they give a 25% bump when using points. So 10k points = $125. I took that opportunity to buy my MIL the 128gb iPhone 15 Plus I mentioned in an earlier post, which was $929 (yes they do have a slight $30 premium over the official Apple Store price of $899), for 81,380 points (after-tax). Thought it made sense and pulled the trigger, but was the only place I saw the iPhone 15s on any sort of "sale" during this holiday season.