It's straightforward, pretty easy to
do, and is a very inexpensive method to roast coffee. Poppery2's
often appear in thrift shops (~$5 or less) and on Ebay (~$10 plus S&H).
PDF printout of Dung
Truong's alt.coffee posting on Popcorn Popper Roasting. The article,
dated 26 June 2000, provides a nice background on the WearEver Popcorn
Pumpers and the WestBend Popperys.