Originally wrote this for r/battlejackets but it wasn't showing up on that sub, so I am going to post it here. Links for the custom patches are below, however, take a look at these tips I made so you can get the images you're needing beforehand!
//////////////////// TIPS FOR GETTING A PERFECT CUSTOM LOGO/DESIGN \\\\\\\\\\\\\\\\\\\\
-Use paint.net (the app) or photoshop to design the image you're exactly looking for. I recommend maxing the contrast and then adding colors, if you want any. For getting a cutout shape, look here: https://www.google.com/search?q=how+to+add+a+border+paint.net&rlz=1C1CHB...
-This website allows you to increase the quality and size of your images. After numerous images you enhance, you will need to pay, but I say it's worth it, it works really damn well overall. Here it is: https://letsenhance.io/v2/boost
-Putting custom designs and logos on an image and then placing them on a t-shirt is a great way to get patches of whatever you want for cheap. Simply cut out the logos and designs on the shirt, and then sew them onto whatever you want. Just be careful not to mess up
//////////////////// CUSTOM PATCH/PIN/ETC. MAKERS \\\\\\\\\\\\\\\\\\\\
UKR Patcher - Woven/Embroidery/Printed/Pins/T-Shirts (https://www.facebook.com/ukrpatcher/about/?ref=page_internal)
Haven't tried, but I have seen their patches come out great
Superb Patch - Embroidery/Printed (https://www.superbpatch.com/)
Good prices, quality depends on image you use, I think I had a misprint on the rounded corner backpatch, but everything else has been fantastic
Allied Shirts - T-Shirts (https://www.alliedshirts.com/)
Very reliable and pretty cheap, have used many times
Metal Negro - Embroidery (http://metalnegro.com/index.php?id_product=111&controller=product)
Haven't tried
Sticker You - Woven/Embroidery/Printed/Badges/Stickers (https://www.stickeryou.com/products/patches/744?gclid=Cj0KCQiAmfmABhCHAR...)
Haven't tried
Saimon Embroidery - Embroidery (https://www.etsy.com/listing/576184817/custom-patches-your-embroidered-p...)
I don't think the prices get better than this. My patches always come out great from here
BT Patches - Embroidery (https://www.etsy.com/shop/BTpatches?ref=usf_2020)
Haven't tried
Patchman Best - Embroidery (https://www.etsy.com/shop/PatchmanBest?ref=usf_2020)
Had a custom made backpatch, and it came out perfect. Loved it to death.
Black Dungeon Patch - Embroidery (https://www.etsy.com/shop/BlackDungeonPatch?ref=usf_2020)
I haven't tried buying custom patches from her, but my other purchases was in fantastic condition
Obsidian Embroidery - Embroidery (https://www.etsy.com/shop/ObsidianEmbroidery?ref=usf_2020)
Haven't tried
The Cellar Patches - Screen Print (https://www.etsy.com/shop/TheCellarPatches?ref=usf_2020)
Haven't tried, honestly seems incredibly overpriced, but perhaps it lowers depending on the dimensions?
If you are wanting to find even better prices, maybe browse Etsy a little more. Cheers!