Hi all- I wanted to try growing sweet potatoes this year. I know slips can be purchased on line through Johnny Seeds, Southern Exposure, etc., but my travel schedule makes it difficult to order. I can't be confident I'd be in town when they arrive ,and the last thing I want is for the package to be sitting on my porch for a few days! Does anyone know of a local retailer in the DC/MD/VA area?? Thanks so much in advance.