Procedural generators are often free if you look around for a bit.

https://kuhantilope.gumroad.com/l/ultimate-skin

https://extensions.blender.org/add-ons/mpfb/

https://github.com/alessandro-zomparelli/tissue

ymmv, as some paid plugins actually speed up the funky blender workflow (the auto-Bake plugin by the same author is important for procedural generated textures.)

https://sanctus.gumroad.com/l/SLibrary?layout=profile

Have a great day =3