The original run of comics (by Jeremy Sorese and Coleman Engle) ran for 8 issues. They are compiled in these TPBs: Vol 1 Vol 2

There was also a Greg Universe one-shot in the same series (probably my favorite of all the comics). That's available here

The more recent series, Steven Universe and the Crystal Gems, ran for 4 issues. They aren't available in a volume yet, only individual issues. Issue 1 is here, and this is the upcoming paperback.

There's also a standalone graphic novel.

u/Valentinee105 · 2 points r/stevenuniverse

Here is a full list http://steven-universe.wikia.com/wiki/Steven_Universe_(comic_series)

You can find the trades for cheaper than a comic shop by going to amazon

Here for volume 1

Here for volume 2

Here is the Steven Universe & The Crystal Gems trade

Here is graphic novel 1

Here is graphic novel 2

There are also a bunch of scattered issues that will probably be collected into a trade eventually. 2 are 1-shots from the original series. And there is currently a new series that has 6 issues.

Also if you don't mind digital copies of the first two volumes you can get them here for even cheaper

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