I don't think anyone has mentioned
Lulu.com yet, so I'll chime in just in case someone is still looking...
I've done a handful of calendars there and the quality was excellent. The bottom is your basic grid, but it's tough to beat the price ... right now they start at $12.49 for a 11x8.5 (11x17 open) and if you get 5 or more, it drops to $9.99 each.
They run a lot of special deals also... right now you can save 25% on 1-9 calendars (coupon code: FLURRY305, max savings $50) or 30% on 10 or more (code: BLIZZARD305, max savings $100) through Nov. 30th. So that means you end up paying less than $10 each regardless of quantity and shipping is fairly reasonable too.
I currently use Lulu for all of my Log Your Memory print books, so I've done a fair amount of business with them. Their customer service isn't always the greatest, but overall I've been fairly happy with them.