Where to get large aluminum cases for DIY amplifier project?

I am building the ESP high power amp (project 101) which requires fairly substantial heatsinks so I will need a pretty large aluminum case. What would be the best source for those? I see tons of cases on Ebay from China but besides few photos, I have no idea if they are worth it or not. I know that large aluminum case with big heatsinks is not going to be cheap so at least I would like to make sure the quality is good. Last case I purchased on Ebay from China for my preamp was just OK. I still had to enlarge few holes so everything fits properly and use lot of thread locker so parts stay together.
 
Landfall Systems makes excellent aluminum chassis, whatever size you want. I used them for my monster 833C monoblock tube amps, with excellent results. Great service, too!

https://landfallsystems.com/
 

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