I don't know about the COA but it can't be much. I payed less than $3k for mine and I own 3. My guess is about $2500-$2800 depending on condition. I had an offer to buy one for $2400 recently from a guy who had 2 and I bought one. $2400 is a great deal but I don't need another. Be patient as they pop up every now and then. Check EBay for sold items and you will get an idea as well too. Search G0. Newer may cost more as they have bumble bees from 2007 and beyond. Mine are older but I added new pots and caps.