There were 15 guesses; the low guess was $20, and the high was $125. The average of the guesses was $52.59, with the median at $43.
Crappy iPhone resolution. The total was $144.91. The bank couldn't give me the receipt and the ink was too light for their copier to reproduce ... but there were (I think) 448 quarters, 198 dimes, and a hundred-odd each of nickels and pennies. And three $1 coins.
jandriel was the closest, so next time we hit up Mickey D's, the supersize is on me, buddy. :)