I really recently bought 2 sets of speakers though yahoo auctions.
It was nondirectional speakers from early 1970's and
very easier to obtain than I have imagined for decades.
Victor GB-1H(left, globe‐shaped) and GB-2(right, Cuboctahedron).
http://audio-heritage.jp/VICTOR/Speaker/gb-1h.html
http://audio-heritage.jp/VICTOR/Speaker/gb-2.html