The highest "common" resolution I've seen for printing a poster is 5400 x 3600 for the reasonable price of (~$15), but I have the ability to make the images I want to print (procedurally generated) as high of a resolution as possible (within limits of transferring several gb files to the store to print them). I was hoping to get a print with as high res 12K x 8K but maybe this is unnecessary for only a 36" x 24" poster print.
I also hope to print 12K x 8K resolutions for reasonable price similar to 5.4K x 3.6K, since going much higher than that seems to require spending much more money very quickly (~$100 per print or more), so I guess it's important I can get it done cheap. I do want to know what options are out there, even if they are outside my price range.
What would the highest resolution be in 24" x 36" for a canvas print and for what prices?