Yup, it's a buyer's market for just about everything. But 200 watt EVs are worth more than the 90 watt Boogie Celestion ("Black Shadow"), and they are no longer available except as a re-issue.
(There's an original EVM 12L on eBay right now going for $187.50 total.)
I last sold a Thiele on eBay in 2007 - got a low-ball offer of $200 - it eventually sold for $375 plus $25 shipping. Shipping would be closer to $40-50 now.
A brand new Thiele from Mesa is $399.