Then you are limiting yourself to very few casino-bonuses. If any at all. Wager requirements of 10-20x aren't that common. Even if 40-50x seems too high, that's closer to what you would expect a casino to offer you than 10x. Even if you found something that low, there would be other requirements limiting you. A lower maximum bonus cashout amount for example.

You might have more luck finding something suitable in the sports betting bonuses section or forgetting about them altogether.