GPShopper's SLIFTER - 75438 (SLIFT)

It doesn't use GPS and I don't know what Slifter means, but this is a product finder. On http://www.slifter.com/, it says "Try our new FREE Slifter SMS short-code (75438) to search for local products in retail locations near you. Just text your query and zip code to 75438. In seconds you will receive a text message with product and pricing information at the closest retailer!" Oh, so GPS equals zip code. Happy Shopping!