According to an ex-fm, they were available at Bass n Treble in Delhi. But when I called them , they said they no longer stock them and keep Rogue amps instead.
Apart from David Belles site Power Modules, they are also sold through dealers like Gene Rubin Audio and Audio Connection (John. R) in the US and Nunu Distribution in the UK which may not be a viable proposition getting from there considering logistics costs, duty and gst. Not sure if there is a vat refund in the UK for international customers.