I'm trying to organise a day out to Great Malvern from Birmingham, however, I am perplexed about the prices of tickets. Does the Daytripper plus qualify for Great Malvern? or is it the add on? I intend to travel off-peak time.
It's not clear from your original post whether you will be travelling alone or with a group. If you will be travelling with more than one other person you can make use of GroupSave which allows 3 or 4 to travel for the price of 2 (i.e. £18.60).
These are normal walk-up tickets which can be bought from the ticket office (not ticket machines though) immediately before travel. The only caveat is that you must travel as a group and they're not valid on certain TOCs - this shouldn't affect you for this journey though.