Hi.. This is my personal recommendation for a seller I found on Ebay... Diane Howarth.
She sells Cuttlebug embossed sheets of card (or vellum), 12 sheets for £1.20 + 75p P&P. You get to choose from her wide range of folders, and card colours and/or vellum.
I received mine this morning (with some freebies!). Her product, her prices, her communication and her delivery time were all excellent.
THIS is a link to her current Ebay listing for these sheets.
While you're there, check out her Magnolia Tilda and Bella stamped images, too.
NB: I am not receiving anything for making this recommendation, nor had I any contact with Diane prior to finding her on Ebay.