I was about to click BUY on the light my fire replacement steel when it occurred to me that sometimes it is just an incremental cost to replace the hole thing. $12 for the replacement and $20 for a new blade with steel.
This is not an uncommon these in systems. As time passes and *cough* Moore's law get's old and tired it is still in your best interest to replaced that damaged machine with a modern replacement. The US Federal government is having that problem right now, The cost of upgrading the computers is exceeding the cost of maintaining the status quo. Of course since it's a government agency one can argue that if they had been updating all along that costs could fluctuate and then there is the $1000 hammer. But on the other side of the argument is that they could be facing [a] an interruption in service [b] other cost overruns [c] other risk related issues requiring both systems to run in parallel and effectively doubling the cost and risk.
* there is a reason for continuous integration ... risk and cost reduction over the long term.