All the products recommended at the Stone Care Center are only available online, which is the case with essentially all good stone care products. You will see products labeled "Marble Cleaner" in some stores, but most of these are generic cleaners with a "marble" label and perform very poorly.
Authentic / professional care & cleaning products that are engineered specifically for stone (versus a generic cleaner with "marble" or "granite" label) have far superior performance but are a specialty type cleaner. Thus, the market is relatively small and doesn't support the high cost of national retail distribution at this time.
I can appreciate wanting to save on shipping costs for sure. We wish we could control charges from shippers too. Although, ordering products for delivery direct to your door is a real time-saving convenience, so it does have some value.
That said, we are always willing to help as much as possible.