I gave the indoor thing a go several years ago, and accumulated a few airplanes that I now want to sell:
E-flite Beast (pre-AX2 hence no stabilization) with 120 mAh batteries for $25.
Pair of E-flite Extra 300 3D airplanes plus batteries (probably need to be replaced) and 4-cell charging station with 6VDC power supply. It's best to keep these together since one can provide parts for the other if needed. All for $50.
Parkzone Sukoi SU-26xp with charging station for $25.
Please see these offerings at https://www.icloud.com/sharedalbum/#B0pGrq0zwGPwfCC (https://www.icloud.com/sharedalbum/#B0pGrq0zwGPwfCC).
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