Bioware Points - can I only buy what I need?

[Alimeega]

Questions about why Bioware Points still exist aside, is it possible to buy only the amount I need for a DLC?

It only gives me the option of 400, 600, 800 or 1600 (or just the latter two depending on which purchase window I end up at). And looking at the DLC for the games I have that still use Bioware Points I don't think I can make any of them add up to one of these numbers (even if I wanted all of them). Therefore leaving me with left over useless fake currency I've had to pay for.