RedBubble had made it's decision to completely remove calendars from their offer. It's sad to see them go, I really like the way they were designed. But, what's done is done, they are already gone from the site. Currently the only POD service that I use, that has calendars, is deviantArt. I have there the same offer I had on RB but probably they require a little polishing from me. Too bad that a day has only 24 hours. ;)
The easiest way to see my calendars is to follow this link.