We recently purchased a used Meade ETX-90-PE for grab and go. The previous owner had not purchased the hard case, but did keep the scope in the original box.
We looked on the net for a case, but weren't finding anything desirable in either design or price. We continued to just keep an eye out for something we could use as a hard case. That something appears to be a used case from Surplus Shed. The item is number M4058, $35 plus $6 shipping. The stock seems to come and go, so not sure how the supply of these may be long term. I say it appears to work because I just received it and am still doing the rework. That will take a while because I am collecting free foam.
The attached picture shows the case as I received it and the case next to the original Meade ETX-90PE box. The case is smaller by about an inch in height, and larger in other directions. The key to being able to use this case for the ETX-90-PE is to rotate the scope while in the case. There is a picture below showing that if the scope is rotated, it actually does not need the extra height.
Our case came with foam in it. The bottom foam was fine, but the top was starting to shed. That will come out. Don't want nasty foam on our optics.
The case is obviously well used and somewhat abused compared to out other scope hard cases. Surplus Shed as always clearly spelled that out. I had to realign the metal band so that it would close easier and engaged the clasp better. I used wooden blocks and a c-clamp to straighten the band. I also used adjustable wrenches to rotate the band so that the clasps could close more secure.