AMC Yellow eTickets: Purchase discount tickets online in advance for only $9! Good for any participating AMC, any date, and any showing.
Regal E-tickets: $9 discounted tickets good for Regal Cinemas, Edwards Theatres, and United Artists Theatres.
AMC Loews Boston Common 19: $9 College Discounts on Thursdays with valid college ID
Regal Fenway 13: $9 College Discount every evening with valid college ID
Kendall Square Cinema: $11 bargain tickets for the first show of the day on Monday-Friday, and the first show on the weekends and holidays. Student and military pricing may be available with ID from Monday-Thursday.
Showcase Cinemas:Tuesdays are bargain Tuesdays at Showcase Cinemas for $8.50 per movie ticket, not including IMAX.
MFA Films: Members get 2 free tickets to On the Fringe screenings and 2 free tickets to every screening in Jump Cut. Purchase tickets to 3 or more films and get $3 off each ticket. $5 Tickets to regularly-priced film screenings for college students with valid ID (participating colleges).
Somerville Theatre: $8 Matinees Every Day before 6pm, and evening tickets are $11 for adults and $8 for senior citizens 65+.
Capitol Theatre (Arlington): $8 Matinees Every Day before 6pm, and evening tickets are $11 for adults and $8 for senior citizens over age 65.
Studio Cinema (Belmont): 2-for-1 admission on Tuesdays *cash or check only*.
Embassy Cinema (Waltham): Bargain Tuesdays for $6 admission for all shows (not valid on holidays) and $9.50 bargain tickets for all shows before 6pm on Monday-Friday, and the first show on the weekends and holidays. Students and military discounts with ID from Monday-Thursday.
Also, if you are a AAA member, you can take advantage of discount movie tickets at your local AAA branch or online here.
Let me know if I missed any great movie discounts in the comment section below!