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You're gonna want to look at old 70's super robots for the best examples of non Super Sentai/Power Rangers combining robots (but you should really look at some of the older Sentai robos too, cause they're great).
Basically look up the Soul of Chogokin line. Any super robot worth its salt has gotten a Soul of Chogokin at this point. Granted these are expensive pieces, but even the most expensive SOC is cheap compared to the going rate for the original vintage toys.
