Parodi's transcriptions of Doctor Gradus ad Parnassum, La fille aux cheveux de lin, and The Little Shepherd were published in 1955 by Ricordi Americana. I haven't found it available for purchase, but worldcat.org shows it available at several libraries in the US and Canada. If you google '3 composiciones parodi ricordi debussy', the first two hits should assist you. Some of the list entries have an 'Ask a librarian' link you can use to contact the library. Perhaps one of them would be willing to make a copy of the piece you want to study and either send it to you or scan it and email it to you.
If you google '3 composiciones parodi ricordi chopin', you'll find that edition is available from a couple of sources. It contains a waltz, op. 69, no.2, whose original version is in B minor, so that may not be what you're looking for. You can view the piano sheet music at http://imslp.org
to find out. I didn't find any other Chopin transcriptions by Parodi.
I second Dave's suggestion to check out Barbosa-Lima's Impressions.