Is $100 off the price going to make any difference? The price of these gears is what it is. There is a lot of work that went into designing them and making them available sitting in stock on the shelf ready to go. Only Marlin has stepped up to do this for us.
Given all the other work that installing these gears will entail, and all the other parts you need to make it worthwhile (lockers, tires, differential gearing), not to mention the thousands of dollars of fuel it will take to get you to Moab or the Sierra, where you actually need these gears, $100 is nothing. In fact if it's a critical difference, you should save the cash for groceries, rent or your kid's new shoes.
If you want them. pony up and buy them. Marlin is a good guy who has invested big in making something otherwise unobtainable to 80 and 100 series drivers. He's not overcharging, gouging, or trying to squeeze every drop of profit. Like everything else in his business, he's charging a fair price.