Time Box Calendar Spool from Biaugust
This "108Time Box" from Biaugust is a single roll of paper containing nine years worth of calendars, each month represented with a different text treatment.
Sadly, it doesn't appear to actually be for sale. It would be the last calendar you didn't need anyway you'd ever need!
Design Page (Flash) [Biaugust.com via Pan-Dan via Core77]

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Technically, you only need at most 14 calendars, and possibly less (I haven't taken the time to work out if a leap year can happen on each of the seven possible normal year calendars.) At least if you're not writing appointments down on them or anything.