EBay Is Launching A Same-Day Shipping Service Called eBay Now
techcrunch.com
techcrunch.com
For comparison, in Chicago a company called Dining-in has similar constraints -- delivering within about an hour a custom order. They charge $6.99 -- excluding the tip.
A website where people can express they want to purchase something at a certain maximum delivery charge. As soon as enough people want to purchase things in a certain geographic area (based on a calculation of delivery route), they service kicks in - someone picks out all the goods (this would most likely be a grocery store) and then drives and delivers it on that route.