Hello @giraffasus, and welcome to the forum!
Maybe you should first see if you can’t find such brushes in Krita, because there are tons of brushes for Krita. Just take a look in our category for Brushes and Bundles.
The best thing is, by far over 95% off all available resources for Krita are free of charge, AND, which is even more important, so far I only know three paid bundles for Krita that are worth the money (which is my opinion). So, usually you can save your money. Luckily/funnily, the creator of one of the best paid bundles has made his bundle free available in between, so you don’t need to pay for it anymore, not even when used commercially! Another one worth to buy can be found in the Krita shop.
Currently, there exists another paid bundle from which I expect it to be a good resource of high quality brushes worth to buy, but I have to save money for it first. But the free bundles of its creator are all high quality, so I expect the paid one to be at least on their level if not higher.
Without knowing what you need, I’ll list a few of the most interesting bundles for Krita, but I begin with three bundles offering brushes ported from PS to Krita (but they offer nothing Krita had not already/in principle):
DEK (Devin Elle Kurtz) - Foliage & Grass Brushset for Krita by lobabrancrats
Photoshop common brush transfer, with original brush ATTENTION, the download links for this bundle are found in the second post! Or take these links: 1 & 2 (Same bundle, different file hosting services)
MB Starter Pack 2021v4 Recreation for Krita
And now my short list of bundles to look at:
Puplaroid’s Retro Comic Bundle because you mentioned True Grit.
Yet another brush & texture promo - tombofnull because you mentioned True Grit.
Krita 5.x “Expansion” + “Extra” Bundle (IT’S FREE, NOW!) The former paid one I spoke about. What a collection of bundles, simply great.
Memileo lmpasto Brushes Stunning impasto effects, for many painters a reason to drop nearly any other software.
Sketch V2. (UPDATED TO INCLUDE V3) If you sketch, these are the bundles! From Krita’s main brush creator of the last years. The other bundles from @RamonM can be found with descriptions and links to videos presenting them in the Brushes and Bundles category, or directly here without any information about them.
Deevad 2025-01 Brush Bundle Another bundle from a well known creator of Krita brushes, @Deevad. He made a lot of Krita’s stock brushes. Here you can find the bundles he published so far. In my eyes, more than worth a look.
Vinny’s Alpha Test Bundle! (Krita 6) (11.05 UPD: PART 2)
Metallics by Draneria You need metal? Here it comes!
Rakurri Brush Set V2 A huge general purpose bundle, top tier.
FizzyFlower’s “ESSENTIAL” Brushset VERSION 2 The next general purpose bundle, also top tier and even more huge.
URAVERAGEBOI’s Bundle & MyPaint-Brush G-Pen
Yet another brush & texture promo - tombofnull
Wojtryb’s “Won’t teach you to draw” Version 6.0
Mojo Moo for comics If you do comics or manga you’ll probably love it.
Set of Watercolor Brushes Watercolor? This is the bundle you won’t come around.
Chaos ink brushes by アクモル 3 Ink brushes, paid, but if that is your style those 8 bucks will be among your best investments as artist. Read the description on how to use them before you buy, to not burn your money!
Michelist