Martin,
Had an idea: Rather than going to the likes of Truprint again (with assorted website complications etc), how about someone (and I'd be happy to do this myself, though equally happy to pass it on to anyone more skilled in the graphic arts) produces the necessary artwork etc and...
(i)That artwork goes to one of the many companies that could do a small print run fairly cheaply and with good quality- once we had an idea of numbers, obviously.
(ii) With said artwork in (say) PDF format, people could use whatever printer they chose, or even run them off at home.
Apple's calendars are now £14.39 (plus shipping, plus VAT). Which is actually cheaper than Truprint, though still pricey. Really excellent quality, though.