"Make it a Doorbuster" deal allows customers to take an additional 15 percent off starting on Wednesday INDIANAPOLIS, 2016-Nov-23 — /EPR Retail News/ — hhgregg (NYSE:HGG), a leading appliances, electronics and furniture retailer, today ( Nov. 21, 2016) announced its strongest Thanksgiving week offer ever, allowing customers to take an additional 15 percent off hhgregg's already low…