A box of 50 foam plugs costs roughly what a single pair of Hears Sleep costs. It lasts two months used nightly. You restock, you run out, you wake up without them on the worst possible night.
Hears is silicone. Rinse, dry, repeat. 300+ nights from one pair. On a per-night basis, it costs less than foam.
And you get 100 nights to prove it. If Hears Sleep doesn't outperform everything you've tried before, send them back. Full refund. No questions.