You can usually find the purchase price in Steam’s account purchase history, not just on the game page itself. Steam’s support/account history pages show the transaction details, including what you paid, the payment method, and taxes for each purchase.

How to check it

  1. Open Steam and go to your account details or purchase history.
  2. Find the transaction that includes the game.
  3. Open the receipt/details for that purchase to see the amount charged.

Important catch

If you bought multiple games in one bundle or cart, Steam may show the total purchase amount rather than a clean per-game price in the history view. If you want the exact historical store price for a game today, SteamDB can show price history, but that is the game’s market price history, not necessarily the exact amount you personally paid.

Best way to tell the difference

  • What you paid: check Steam purchase history/receipts.
  • What the game was priced at over time: check a price-history site like SteamDB.

TL;DR: Use Steam’s purchase history to see your real paid amount, and use SteamDB only if you want the game’s historical store price.