I printed mine through Docucopies.com last year. Compared to a lot of other places, their price was the best I found… if you’re willing to wait for a sale. I went with them primarily because they were one of the few places that would allow me to design my own calendar and not oblige me to use their template, but they do also have template options if you’re not a designer.
James also offers a Custom Artist’s Calendar. I’m sure he’d be happy to inform you about printing through Lenspiration.