We do not currently have a directory of cemeteries in western Massachusetts, other than a short list maintained by the Green Burial Committee of cemeteries that permit "natural" burial.  (See Green Burial in Massachusetts website.)

We recommend this informative page at the national FCA website:
      Consumer's Guide to Cemetery Purchases

and this Federal Trade Commission webpage:
      Buying a Cemetery Site.

We have not conducted a price survey of cemeteries operating in our regioin. If you think this would be a worthwhile project, please let us know. New volunteers would, of course, be required for such a project. 

For historic and genealogical purposes, FindaGrave.com can be useful. They have information for "over 400,000 cemeteries in over 200 different countries." If you select "Cemetery Lookup" and choose our state and one of our counties (without typing anything in the name field), you can retrieve a very long list of local cemeteries, e.g., over 200 in Hampden county, but with no information about which ones might still sell plots.