From where to get Black and white maps

Corona Corona Common General CG Discussion
1

Hi,
Fellow members, where can I purchase black and white maps for controlling glossiness, layer masking in 3ds max composite etc. I have attached an example

BW45.jpg
BW45.jpg2500×2500 737 KB

2

I know these ones https://3dcollective.es/producto/pack-01-mascaras-suciedad/