US Amazon does sell them a lot cheaper than Amazon UK/EU, but still not nearly as cheap as in Japan. I love the Prera, though- a terrific thing. For the money it is very precisely made, and comfortable despite its size.
The Metropolitan/MR has the same lovely nibs, but as you mention the step from body to section, combined with how narrow the section is, make it unpleasant to use. As one of the entry level pens in this hobby I fear it puts people off.
As an aside, I have big hands and bigger sections suit me. Sadly in non-Chinese fountain pen land, section size is related to cost- the more you spend, the bigger it gets, which is absurd. Some fairly narrow pens- Prera and Kaweco Sport, are comfortable, though my Custom 823 is ideal.