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This is for 17" crt search on ebay. Certainly location applies.
For years "gamers" have been drooling over large CRTs, the prices are inflated because there is enough demand at those high prices. Same like Voodoo, but a bit slower to sell, because of their nature and size, still sell fast enough that prices won't go down.
As amigaspeaking says, patience is your friend.
I got a Syncmaster for free from a collegue who had it gathering dust in the garage. It's got a perfectly good picture 1024x768 at 85Hz. I'm not sure why I should pay 300 euros or more to get maybe 100Hz refresh.
So my recommendation is just wait until some normal 17" pops up for free.
It's going to be a secondary screen after all. High refresh rates and best in class picture quality like those Trinitrons were used by professionals who stared at pixels for 8 hours daily.
Nowadays "gamers" buy them but that was not the case back in the day.