Make sure you have understood our Terms of Service before placing pixels. You are placing:

pixel(s) you already own.These pixels are updated at no cost.

pixel(s) you owned at least once in the past.These pixels will not increase in price after purchase.

pixel(s) you've never owned.

(You can see which pixels these are with the price heatmap)

The estimated price is shown at the bottom, however you can set a hard limit in case prices rise at the last second: