Book Mock-up Recommendations?

Hi all,

I’m a big Canva fan for creating promotional graphics, but I’m finding myself startlingly disappointed at their mock-up options for book covers. Does anyone else have recommendations on this front? I have enough GIMP-saavy to just make some myself from scratch if I have to, but I wanted to check if there might be a faster/easier option before I dive down that rabbit hole.

Thanks!