Disney has started populating the Shop Disney Parks app with prices for merchandise that will be available inside Star Wars: Galaxy's Edge. Their aren't any pictures in the app right now, but if you can decipher the descriptions they've used, then you can get a pretty good idea what will be available in the new land and what those items will cost. I've included a list of all the prices we've found thus far on this page.
Thanks to The Dan-O Channel for letting folks know these prices were published.
You should be able to scroll through the list of items and prices below, but if you have any trouble reading the embedded list on this page, then you can also view the same data as a separate page.
As we find more information, we'll continue to update this page for the next few days, up through the land's official opening in Disneyland on May 31, 2019.