Yep, this is definitely true...
My last order was
60 small rats @ .99 = $60
about 40 for shipping (includes dry ice, 2 day shipping, and insurance)
Total about $100, so about $1.67 a rat.
Now this was pretty cool, I had to get it shipped to work and they x-ray everything. Needless to say, the mail guy had a few questions why there were a ton of dead rats on the x-ray screen.