Note: Unless money is no object or if you plan on eating fish 3 meals a day for the duration, bring as much food along as you can. We decided to pack light and buy the food up there like we do on other vacations in N. WI. Bad idea, food is shockingly pricey north of the border.
Wini...Regarding prices being negotiable...All I mean is anything in life is negotiable. How bad a lodge owner wants to have their beds filled during a specific week might mean they are willing to negotiate price. Not all places have been like this, especially ones that are booked out at near 100% capacity year over year.
I always put myself in the owner's shoes and think how would I feel if someone approached me about negotiating price. I appreciate this is how they put food on their table so I am very respectful of what my negotiated price might be. In many instances if I am flexible with the week of travel that also helps with the price. Example, one recent trip I was giving $100 off per person as I switched weeks for them(lodge owner initiated idea of a discount, not me.) I have also found if you offer to do catch and release(keeping only what you eat while there) vs. harvesting your "allotted amount" of fish to take home they will forgive an extra $50-100 on occasion. To your point bigger groups definitely reward you with discounts. I guess my point is, be creative and polite and in my humble opinion/experience the price becomes more flexible than advertised!
For the record...as long as I am not up the week after the big may fly hatches I don't care when I go!!!
Good luck!!! Just over 2 months and I am crossing the border!