I stayed at the Marriott which I think is about as close as you can get to the Start/Finish and was very happy.
Tour des Voyageurs is one minute walk to transition (depending on which door you exit)
that said, Marriott is nicer but i just got my confirmation for next year
$410 per night + $45 for extra person in room (5) + $13 per night for parking x (GST + PST+ Resort tax)
Also, if i cancel AFTER Oct 9, 2015 there is a $531.81 penalty
Ermitage du Lac is across the street from Tour des Voyageurs (thus 3 minute walk to transition). i paid $307 per night (not including taxes and parking)
biggest difference between marriott and ermigate, was mariott had unlimited wifi, hot breakfast and full fridge
ermigate had Continental breakfast (cereal, bread, muffin etc), 2 devices to connect to wifi and bar fridge
Where are you seeing that cancellation policy?
I just looked up bookings for the IM weekend at that hotel, they have the same cancellation policy listed as most the other hotels:
Exception: Ironman Events from June 23 to 26, 2016 and from August 18 to 21, 2016 - All cancellations made 31 days and more prior to arrival will be fully refundable - All cancellations made 30 days and less to arrival will forfeit the deposit.
Please review your reservation details and keep for your records.

Residence Inn Mont Tremblant Manoir Labelle
170 Chemin Cure Deslauriers . Mont-Tremblant, Quebec J8E 1C9 Canada ]]
1-819-681-4000Hotel WebsiteMap & DirectionsPlan Your Stay
CHECK-IN DATEThursday, August 18, 2016CHECK-IN TIME04:00 PMCHECK-OUT DATETuesday, August 23, 2016CHECK-OUT TIME12:00 PMModify your reservationCancel your reservationWe are happy to confirm your reservation with Residence Inn by Marriott, the all-suite hotel designed for all your needs. Below is a summary of your reservation details. Enjoy your stay with us.Sincerely,
Residence Inn Mont Tremblant Manoir Labelle
Enhance Your Stay

Every Room is a Suite
Full kitchens and separate spaces to work & relax
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Free Wi-Fi
Stay connected throughout the suite and hotel.
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Free Hot Breakfast
Choose from a variety of healthy and indulgent options.
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Relax Outdoors
Enjoy our outdoor living room, fire pit & grill.
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Room Details

ROOM TYPE1 Bedroom Suite, 2 Double, Sofa bed, Fireplace
NUMBER OF ROOMS1GUESTS PER ROOM5GUARANTEED METHODOther guaranteeHotel Alert
All rates at this hotel include complimentary breakfast and in-room high speed internet access
Summary of Charges

RATES ARE PER ROOM, PER NIGHT (CAD)Thursday, August 18, 2016-Monday, August 22, 20164 nights410.00 CADSpecial Event Rate, buffet breakfast daily, deposit required, see Rate RulesMonday, August 22, 2016-Tuesday, August 23, 20161 night269.00 CADRegular rate, deposit required, see Rate RulesESTIMATED GOVERNMENT TAXES & FEES78.62 CADExtra adult charge (children may be exempted)45.00 CADTotal for stay (for all rooms)2,527.08 CADOther Charges•On-site parking, fee: 13 CAD dailyModify or cancel your reservationBook Another Reservation
Rate and Cancellation Details

•Please note that a change in the length or dates of your reservation may result in a rate change.•To ensure that you receive this special rate, we will charge your credit card a prepayment of 910.65 CAD.•Please note that only credit card prepayments are accepted.•You may cancel your reservation for no charge until Friday, October 9, 2015.•
Please note that we will assess a fee of 538.81 CAD if you must cancel after this deadline.
If you have made a prepayment, we will retain all or part of your prepayment. If not, we will charge your credit card.
RATE GUARANTEE LIMITATION(S)•Changes in taxes or fees implemented after booking will affect the total room price.•Please note that a change in the length or dates of your reservation may result in a rate change.ADDITIONAL INFORMATION•The Responsible Tourist and Traveler
A practical guide to help you make your trip an enriching experience