I just got a copy for Christmas, but mine is much smaller. It is about 8 inches by 6 inches. If you found one for $1.80 that is an increadible steal! I think the one I was given was around $40.00 U.S. and there were no copies that we could find that were any cheaper through a bibliofind or AABE search.
I have never heard of any other "Parts" that were ever published.
Enjoy it! It truly is a rare treat and one of the "original" sources for many later Shanty books.