The data you're looking for is at /data/data/com.ct.dev.terminal/databases/ct_terminal.db in a table called LocalGoods.
You'll need root, or a debug build (which it sounds like you might already be running, and these import entertainment machines often are right out of the crate).
Pull the DB locally with:
adb pull /data/data/com.ct.dev.terminal/databases/ct_terminal.db
Edit it using a SQLite editor (I'd recommend "DB Browser for SQLite", Google it). Under each row (product) there's a price column, which is mainly what you are looking for. There's also vip_price, ot_price (the crossed-out "on sale" price), and a cost column for tracking margin.