Need a good source of mockups as soon as possible. Looking primarily for quality here. Any good suggestions?

What kind of mockups? Ah, I didn't notice it in the title.Yes I can share something like that. Here, for instance, you will find mockups for box packaging https://www.ls.graphics/mockups/box-packaging . And it isn’t the only type of products available on this website, they have pretty much everything you can think of. The prices aren’t that steep, but the quality is always supreme. Hope my suggestion helps you.