Need advice on where to get new engine

[washer6]

Hi Guys.
I want to get my 450X Honda's engine rebuild. a bike shop charges me R24000, now I wonder if it will not be better to try and get a new engine or maybe a good second hand engine.
any help on where to look will be greatly appreciated.
THanks

 

[zebra]

 

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[Chili Dog]

 

[Lear300]

 

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[Lear300]