HangtownMatt,
That is confusing. I go to the Mahindra web site select products, under new product select 2415HST, select view specs at the bottom of that page is a link to the mid mount mower including price and specs. See if this link comes through:
Mahindra USA - Attachments and Accessories
I happen to talk to the dealer again today, ( a pleasure to talk to, I forgot to ask him about tractors and had to call him back). He gave me a price of $15000 HST with FEL ($1000 less for gear). A price of $850 for a 4' rotary cutter, $1000 for a pull behind rear discharge finish mower. I assume 60", but didn't probe for the brand or details but he knows its for personal use not commercial.
More to the point, he then surprised me by saying if I prefered to go with the belly mower it would be $180 less than the finish mower. I said how come the belly mower is less than the rear mower and he said he is taking the profit on the tractor FEL and passing along the belly mowers at cost. If I go that way, the belly mower is preconfigured and he had no additional setup work to do. We were talking a package deal but he was telling me the component prices so I pass them along. Maybe the mower is made by the company you listed, I don't know.