I've told myself to make it a habit to never leave a tube set unattended. BUT I know I get quite overconfidant and will leave it on when I use the rest room, or get a bit to eat. This story will make me think twice about leaving them on unattended for even a short time.
Glad you caught the set before it did something real serious, as in your residence going up in flames. I wish you the best of luck. Try Moyers Electronics to get another flyback, controls and coils.
http://www.moyerelectronics.com/
As for the price. If you plan to keep the TV then it is worth it to buy parts for it. It makes you happy using it.
Best regards,
Matt Davala