I would recommend the LittleForBig bigshield gen 2. I have an average sized mouth and they are great for me. My wife has a smaller mouth and she did not like them. Last night I slept all through the night and my paci didn't fall out. I don't know if it's related, but I also didn't wake my wife up with my snoring. So win/win for both of us.

I got my pacifiers off amazon. I think it was around $15 for a three pack. Black, white, and green. Nothing fancy, but I really enjoy them. I've used the black one exclusively about six months now. Not every night, but a few a week. It's holding up well in my opinion. The wife is concerned about pacifier use affecting my teeth or I would use it every night.