Yes, most of the canister masks have valves but many, many more of the simpler respirator masks are produced and sold than the canister type. 3M makes over 95 Million N95 masks per month such as this 3M 8200 N95 Respirator mask. They have a foam seal that fits to the face and when you inhale you can feel the respirator tighten the seal to your face.
These are much, much better than the loose masks that Karen wears.
Even with these masks you have to replace them on occasion and follow a procedure in order for them to be effective.