Thinking to the most basic biology research I know, that's got to be at least $25,000 to get started. And as a scientist I don't know how much I'd trust results from someone's unregulated garage.
That said, I once heard a legent that the founder of New England Biolabs sold the first restriction enzymes out of a cooler in the trunk of his car in the 70s. I wonder if they were produced in a garage, too?