What can you use instead of morel mushrooms
Morel mushrooms have a very woodsy, earthy flavor, so if you must substitute, I'd use another variety of wild mushrooms (dried should be fine), or you could try something like porcini or hen-of-the-woods (the former might be easier to find).
Fresh Chanterelles or dried porcini mushrooms can be used
Fresh chanterelles should be arriving soon, although I haven't seen them yet. That said, morels are kind of unique for their fancy cap, texture and flavor. The dried version can't come close to the fresh ones.
Any variety of wild mushrooms (oyster, shiitake, maitake, etc.) should be sufficient. I would avoid portobellos and white button mushrooms. If you can find/afford morels, they are a real treat!