Buy some ?
Interfaces; I don't like most of them. I decided to invest a few more dollars to get everything right away (I have a FA-66 from when they were made in Japan by Edirol); ΒΌ inputs, XRL inputs & phantom power, RCA inputs, s/pdif (optic input/output), MIDI in/out, 4 outputs with direct monitoring and FireWire.
What I really needed, that you won't find on every product out there around 100-200$, was FireWire, direct monitoring, midi i/o and 4 balanced outputs. You have your normal 2 outputs (left right) where the volume knob on the interface affects the volume of those outputs (to your speakers/monitors) and the 2 other Left Right outputs are not affected by the volume knob. It's perfect to feed a mixer. Personally what I do with that is route those 2nd outputs to the RCA input and can therefor directly manipulate the sound from my computer. For instance, I can watch YouTube or play CoD and downtune the sound as I'm watching/playing (for fun) or simply just record something off the net directly where downloading isn't possible.
Anyway, depends of your needs. FireWire was what I needed because I wanted the processing to be done by the unit itself, not the computer CPU like with USB interfaces.
I'll go with Focusrite eventually, when I'll upgrade.