New audio interface that can be bus powered by at least newer ipads: Fluid SRI-2
The MSRP is $249 USD.
I don't have one, don't plan to, and don't know anything more than that this is available. Good luck!
Anodized aluminum chassis housing and master volume knob
Professional grade 24-bit/192kHz digital conversion
2 class A microphone preamps with +48 V phantom power
2 x XLR/TRS combo inputs on the front panel for Line / Mic / Instrument recording
4 TRS outputs, for 2 monitor pairs with A / B button
1 headphone output with separate volume control, 2 x 75mW
LED indicators on all knobs
Powered by USB 2.0 connection
Cubase LE DAW software included via download for PC and Mac
Cubasis LE DAW for iPad (IOS 9 and later)
OS support: OSX 10.6.4 and newer, Windows 7/8/8.1 and Windows 10 x86/x64