As of 2015, PET scanners cost about half a million dollars, with most machines between $200,000 and $600,000. The lowest-cost PET scanners are used models from the early 2000s -- these have prices in the low thousands.
PET scanner price is related to the number of slices a machine can produce at once. A slice, in medical jargon, is a cross-sectional image. Machines capable of producing up to 64 slices at a single scan are currently available. These make up the high end of the market and cost hundreds of thousands of dollars.
Older machines, capable of doing one or two slices, are at the lowest end off the price scale. Machines that can do four to sixteen slices make up the bulk of the PET scanner market and cost around half a million dollars.