These are available free online from the state of Massachusetts, the master link is below; many have recently been updated, make sure you have the current ones.

This is the master link;
http://www.mass.gov/lwd/labor-standards/dls/massachusetts-workplace-poster-requirements.html

Individually broken out below:

Wage and hour poster
http://www.mass.gov/ago/docs/workplace/wage/wagehourposter.pdf

Massachusetts Commission Against Discrimination
(fair employment poster, model sexual harassment policy)
http://www.mass.gov/mcad/posters.html

Unemployment Insurance Coverage
http://www.mass.gov/lwd/docs/dua/2553a-508.pdf

Department of Industrial Accidents
http://www.mass.gov/lwd/workers-compensation/wc-pubs/forms/form-list-alphabetical/posters/

Department of Labor Standards
http://www.mass.gov/lwd/docs/dos/rtk/rtk-poster.pdf