We (ScopeGuard) are certainly one option. It just depends what you want in a case. If you are looking for something to protect your FS-152 for transporting to your dark sky or club site, star party, if you perhaps want or need to ship it at some point you might consider a case built to meet or exceed ATA Specs. If you need a case for display purposes there are other excellent options as well.
You might consider a 'hardware' case - normally used to transport musicians' gear. Check out www.hardcase.com/English/acchardware.htm for an example. You'd have to line the thing with foam yourself, of course.