In the Japanese home market, several of the transceivers available in the USA and Europe are available in lower power versions too. For example, the IC7000 is available as a 50W version and a 20W version. Prices aren't always lower though. For example on the www.icom.jp site, the IC7000S (20W) is available at 168000 yen, the same price as the 100W radio.
The reason these lower power radios are not available outside of Japan is clear: lack of sales volumes and lack of the necessary approvals. It is a pity that the major dealers like W&S and Martin Lynch don't offer to import these on request though if they met EMC specs as I can imagine a reasonable market with QRPers with a bit of advertising: they have enough space in RadCom and PW after all!