I can then check for the current best prices from verified, safe retailers.

However, the path of the bargain hunter is paved with potential pitfalls:

Many indie developers have stated they would prefer you pirate their game than buy from certain gray market resellers, as chargebacks from fraudulent keys can actually cost the developers money [11, 14]. Safer Alternatives

If you want to save money without the risk, stick to that receive their keys directly from publishers.

A key bought for pennies in one country often won't activate in another [17].