you are most assuredly not going to find a new chassis... pretty unlikely in decent used condition that is in any better shape than what you have got already.
Every manufacturer stopped making CRT monitors a number of years ago when LCD's and plasma displays started hitting the market. Deflection IC's, horizontal output transistors, and video amplifiers used in CRT's are becoming harder and harder to source. Nobody makes CRT monitors, so nobody is bothering to make the parts.
if your chassis is in decent condition...and nobody has messed with it... Likely a "capkit" is going to set things right again. while I can't 100% assure you it will (i mean there are 1000 parts on there that could possibly go bad.) it's one of the most common problems.