An audio interface is the bridge between your instruments and your computer. The Focusrite Scarlett 2i2 is the world's most popular interface, and used prices start at $70-$90 — a fraction of the $170 new price.
Under $200 used, you can find the Focusrite Scarlett 2i2/4i4, PreSonus AudioBox, Steinberg UR22, and even entry-level Universal Audio Volt interfaces. All of these deliver professional-quality recording at home studio budgets.
When choosing an interface, consider: how many inputs do you need? Two inputs cover most solo recording (one mic, one instrument). Four inputs let you record a stereo pair or a band simultaneously.
USB-C interfaces are becoming standard, but older USB 2.0 interfaces work just as well for most recording. The difference in latency is negligible for home recording.
