Without doing the research for you - check out RedFlagDeals forums. Assuming you have internet, I think you can get good VOIP.
Do you use/need the phone number - don't you have a cell? There is currently a thing for Public Mobile where you pay $8 a month for 50 minutes and 50 texts - you should be able to port your number there no problem.
Thanks for the suggestion.
I do have a cell but my parents are a little old school - they are comfortable with a land line since that is the number they always give out to vendors/service providers etc. Yes, they have cell phones as well but they want the landline.
I'll check out Red Flag Deals.
I just want to replace the expensive landline plan to something which keeps the landline active with the same number but for a lower cost.