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Sorry, I don't think such a thing exists. Everything in bulk will be expensive. I'd suggest just heading down to your local dollar store and buying a bunch of cards. They're 2 for $1, and that's probably the best deal you'll get anywhere.

Im sure you could buy in bulk on ebay or maybe even on hallmarks web-site. Problem is if it isn't an assortment of different ones for boys and girls it will be useless. Have you considered being proactive and just building free ones online and sending via email? Those are really fun and interactive. Just a thought.

most of the christmas cards nowadays are printed in china and the pictures are crude. Its very difficult to buy good cards. Ireland used to print the best cards but not any longer. That too is gone to china

you can buy them cheap enough on ebay or make them yourself!

card factory do cheap ones to 5 for £1.00 or try the pound shop

Do you mean christmas cards since this is the christmas section?....