You are never going to find a 100D with a 15k discount. The big discounts one hears about are discounts on a P100D (or discontinued 90D), and those discounts are based upon the original price (before recent price reductions), not the current price.
Take, for example, this one
Inventory | Tesla, listed on EV-CPO as having a $12,100 discount. A new custom order for such a vehicle is $108,300 (which also includes premium audio, unlike the featured vehicle), which really means it is only a $7,900 discount from a more fully-optioned current model.
Or take, for example, this second one
Inventory | Tesla, listed on EV-CPO as having a $9,300 discount. A new custom order for such a vehicle is $97,500, which means the featured vehicle costs $400 more than a new custom order for the same thing.