For a good paid option, Alfred[0] includes a pretty robust clipboard history manager along with a ton of other features, all in an extremely lightweight (15.6MB disk size/~40MB memory) package. You need the paid Power Pack for to use that feature, but both single version and lifetime upgrade licenses are cheap. I went for the lifetime upgrade option which so far has worked out to $12/year and improves in value each year.
[0]: https://www.alfredapp.com