Actually, I think the "your housing leaked and killed my camera " problems, aka liability, may explain your difficulty in finding an underwater housing for rent.
I rented a PD150 housing from Video Equipment Rentals (VER, www.verrents.com) in Vegas, and they have offices all over the country. Don't think they have one in NY but maybe in DC or someplace else not too far away... it was pricey, I think $300 for a day. I think the official Panasonic one goes for like $1200 at B&H.
Not too many people want to try underwater shots in the hudson and east rivers.
Hope you're up on your shots.
Pick up a 411 and start calling rental companies. Usually the associates are good enough to recommend a place that might have something they're not interested in carrying.
Nah, no shooting in the Hudson or East River. It's a lake shot.
I checked out ASL in Long Island, but they want $175 per day for their cheepest housing. I guess when there's no competition, they can be ridiculous like that. I guess the search continues....
You can buy a solid water housing from Epic for a few hundred bucks. I shoot surfing in Hawaii and while I wouldn't use it in serious waves, it should be fine for a floatable housing. Some housings are 15 lbs. and made for diving, while the lighter, more bouyant ones are good for above water stuff- this is a bouyant housing. I have not used the Epic yet, but I have heard it is decent. I may get one soon. http://www.epiccam.com/
Also, heres a tip on how to keep water spots off the lens (a sure sign of an amateur water cam operator). While in the water spit on the lens, put it under the water, lick the lens, put it under the water, spit on the lens, put it under the water, and so on and so on- and voila, no lame water spots like that movie Open Water had. Not saying the movie was terrible- just the water spots.
Eh, I don't think it'll be the prettiest thing, but it should hold up for a few minutes. Enough time to get the shot. I'll probably junk it when I'm done.