In another thread I posted a yellow cake recipe that uses oil. http://cakecentral.com/modules.php?name=Forums&file=viewtopic&p=7256774&highlight=#7256774 It's quite tasty, simple to make, and is much cheaper than my all-butter recipe.
I don't know of a cheap cake recipe but here's a suggestion that might help: Do you buy your ingredients in bulk? If not, you may be able to keep your current recipes at a lower cost to you. I recently started buying things like flour and butter in bulk and it has made a huge difference in my COGS. HTH.
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