There are plenty of options at that price range. But if you only need the one jack for yourself, a solid choice is the Mackie 402vlz4 mixer ($100):
https://www.sweetwater.com/store/detail/402VLZ4 It may seem odd buying a mixer just for the headphone amp, but that's the point: You get a solid headphone amp along with a quiet little mixer -- not to mention two Onyx mic pres -- added to your toolbox.
For more than one amp, I recommend the AKG HP4E ($99):
https://www.sweetwater.com/store/detail/HP4E Yes, there are cheaper options from "second tier" makers that run in the $25-75 range, and they do the job, but unless you're on tight budget, I'd go for something else with a better quality build.