For a fully programmable brushed ESC with lipo cutoff there's the Tekin FX and FX-R. Easy to set up using the lights but add the Tekin Hotwire and you can tune everything with a laptop.
For MRT ESCs, the only one with a lipo cutoff is the MRT MX TSX.
Plenty of old brushed race ESCs around going very cheap, but none of them will have a lipo cutoff. For racing in a mini you are unlikely to ever get the battery low enough for a cutoff, and you can always add a separate lipo alarm or cutoff just in case.
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