Red triangle no shift after overnight storm

I own a 2009 touring that I bought with 96000 miles and now have about 105k on it. I have changed the 12v battery to the optima and changed plugs, transaxle fluid, inverter fluid about 4 months ago. I have changed oil and filter twice since I owned it. (June 2012)

Now the problem, I got stuck on the Long Island Expressway (aka the LIE "the worlds biggest lie"), the snow got too deep and I was struggling to keep going. While driving the slip warning light (VSC)came on often.

I had a friend with 4WD tow me home about 10 miles varying speeds from 10mph to about 35mph, I kept the car in neutral most of the time and when I saw hybrid battery getting low (last blue or first purple)I would put car in drive to charge it. When we got to my house, I had to dig out a spot in front then was able to drive vehicle for the few feet to get it out of the middle of the street.

Yesterday I tried to start car and it looks like the 12v battery was drained. I am. It sure if I pushed the park button and then turned car off but I do normally so I would say that I did. I tried to jump it and I got lights on dash with the dreaded red triangle and engine light among others. The touch screen display read that the vehicle was not in park and I should get to a flat surface and apply parking brake. Also the light on the power button would sometimes be green and then go amber and the park light was flashing green. I could not get shift lever Togo into drive or reverse or neutral.

I did put a trickle charger on it overnight from the engine compartment but have not ventured out there yet.

Is there any hope of a inexpensive / no cost solution or am I going to be paying the bank for a driveway decoration?

 

Oh I also forgot to mention I left the flashers on too.

 

Thanks guys. So far the charge worked and I was able to put it in the driveway. Roads here are such a mess I did not want to chance driving it around again.
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Sorry I did not respond sooner but had to go next door and use the snowblower for a few hours then go get something to eat. BTW we got 33.6 inches of snow I WILL NOT be using the Prius if there is another storm like this.