Where do you find stock elements?

So I tend to be a cheapskate and I hate to buy stock content because I think I will just find it on my own or make it. But I recently came across Envato Elements (when I was looking for good font combinations for an ebook) and thought it would help me get some things I have to do at times done quickly, especially when I don't care 'creatively' about the output but just need a reasonable output.

Probably other people here don't have my problems using stock content, and know good alternatives.

I want stuff where I can quickly find tweakable print templates, video / audio, fonts etc. in one place so I can make a potential project presentation quickly.

What tools do you use to get the boring parts of 'creative' work done quickly?