Business Card Printing (Grimsby, UK)
As the name suggests they do what it says on the tin: business cards in every possible iteration. You can have plain old uncoated business cards, matt ones, silk ones, luxurious triple-ply types - extra thick 920gsm. They do cards with rounded corners, appointment cards, and even digitally embossed cards, Very fancy. Click on the name link to see the range and buy online.
Banana Print (Market Harborough, UK)
Cheap business cards in various styles: square business cards, mini business cards, loyalty cards and folded business cards.
Jukebox (Ontario & Vancouver, Canada)
All sorts of business cards on some very interesting materials including hemp and other lovely craft looking stock.