You may also want to consider buying a used or refurbished monitor. Back in the day when this kind of stuff was expensive to replace, a repair on a monitor at a local shop cost $50 labor plus parts. Not bad for a $500 CRT. However, unless these places are still around and willing to do work for a fraction of the price, you may as well just shop for a replacement. I don't know if your particular monitor was special in any way, but last I checked (around 2-3 years ago) some places that deal with surplus/used/liquidation equipment were selling top shelf used 19" CRT for $50-90 depending on condition and how high end a monitor. Some of these were pretty much perfect monitors which had come off lease. I can imagine that if any of these places have any left over, they'd be almost giving them away.
You can also consider fixing it yourself as it seems over half of CRT failures are simply cold solder joints (I guess the weight stresses stuff until they break). Just a warning though, there are parts in a CRT that you should NEVER touch because it will kill you from high voltages. You can probably search online for some guides on CRT repair so you know what parts to avoid, or even how to discharge those parts to make them safe (leaving it unplugged for a while does NOT discharge them enough). If a cold solder joint is the problem and you are able to find it and fix it, then the monitor becomes perfect again with just a bit of your time and a smidgen of solder. Please, please heed the warnings though. I don't want to be responsible for you getting electrocuted.
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