Isn't it funny how a three year old thread can be a topic of debate once someone dredges it up?
I use 4 inch couplers with deli cups. I found a Janitorial supply store that is very inexpensive when I buy in bulk. .
I just made the trip to home depot for some 4-inch couplers. i'm looking at superiorshippingsupplies.com for the deli cups, but the 8-oz cups just seem to shallow. do you use the 8-oz or 12-oz size?