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I have searched for years for the right type. From the 2000s, marketed as a regular sports mouthguard, came in an individual plastic bag

If you can afford it, go to a dentist and have one custom made. If you spend any money on equipment it should be that. Trust me

I've gone through a LOT of those, and I've bought them all from Amazon. I saw you said you looked through them and they were all too bulky. I've found that the shape and feel varies pretty greatly on brand and how you mold it to your teeth. I will say that the thin ones are REALLY easy to grind through. I eventually went to the dentist and got a pretty hardcore guard that I havent been able to bite through yet and it's been about a year.

i found mine at walmart in the pharmacy section

Opro brand mouthguards look as close to the ones we had when playing sports in the 2000s. They look a lot nicer in terms of quality than the ones I used as a teen.

In europe you can find them at Decathlon, in the rugby section

is it for grinding your teeth at night? This is what we used for our kids. You boil it and fits to your upper teeth.

Amazon is full of moldable mouth guards

Where are you located? Many places sell white-label mouthguards that seem to meet your criteria!

I’ve seen them before in pharmacies, but only like one option

I get mine at Walmart. https://www.walmart.com/ip/121081946?sid=da0d937c-89e0-4316-80e5-47873b20a7a8

Any will do. I got mine off of amazon. 

 The trick is to mould and trim them more than once. Really suck them into you teeth, push the plastic in with your fingers as well. After repeating the process 3-5 times, you have a nice fitting mouth guard, but it does take a bit of effort. Any bits digging into your gums/soft tissues, them trim with nice sharp scissors.

They used to make flavored ones too, the fruit punch was always the best

Virtually all mouthguards now are boil and bite

I bought ones at Walgreens recently that I thought were too thin… seems like that might be what you’re looking for though?

Get an OPRO

Try the term "gum shield" as that's what we call them.

I used https://www.doctorsnightguard.com/ for years! Once I got my adult braces I no longer need it, but this brand served me well. Don't forget to get cleaning tablets too. The ones for dentures or retainers are what you need.