Cheapest 2nd hand that's decent would be a Gemini X, around £80-100.
I converted an old Gemini II 40Mhz to 2.4 using the FrSky hack module, was easy and cost me a total of around £50 with a 2nd hand Gemini II and new module plus RX.
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Back from 30 year retirement finding use for my thumbs again, slowly getting faster!
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