Three's Company, The Ropers and Three's a Crowd

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Haven't selected a flag icon as there have been physical media DVD releases of Three's Company in the States and Germany.

Based on EpGuides, it had a spin-off series called The Ropers, and a follow-up series called Three's a Crowd.

Based on Three's Company's IMDb company credits page, Anchor Bay released season sets in the States. There was also a complete series set with several extras (but that, based on the price, is out-of-print). It's also had DVD releases in Germany, but some of those look to be out-of-print also.