Misprint Price Guessing Game

You will be shown 10 pictures. Guess the sale price of the card(s) in each picture. Your final score is calculated based on how close you were on each guess. 1000 is the best possible score and 0 is the worst, with being the current average. All sale prices are in USD and rounded to the nearest integer. (If you're on mobile, make sure you don't miss images. Scroll to the right or zoom out.)

I know you cheated.