I believe some dealers still have the boards. Unfortuantly the Pegasos at the moment seems to be limited to runs done every 15th of a month after a bunch of preorders have been filled.
Even with that limit on production, chances are you'd get a Pegasos (or AmigaOne) much faster then it would take to design and build a new Amiga classic in ITX form factor... Not to mention find a source of AGA chips.
