Aldi, the German grocer known for its high-quality products and ultra-low prices, is heading to Rockville Pike. Plans call for a fall opening in the former H.H. Gregg space at Congressional North shopping center, a few doors down from Bed Bath & Beyond. This is one of six new Aldi stores scheduled to open in Maryland this year, but the company tells us it’s the only one planned for Montgomery County at this time. Aldi is something of a corporate cousin to Trader Joe’s — they both originated from the same parent company — and the two chains have a similar business model: small stores, limited product selection and mostly private-label brands. But Aldi cuts prices even further by dispensing with every frill — meaning that you’ll have to bring your own bags, pack your own groceries, even put down a refundable deposit on your shopping cart. (If you’d rather just stick with Trader Joe’s, there’s also a new one of those coming to Rockville this year. Click here for details. And did you hear about the Wegmans store planned for Rockville Pike? Click here for more on that.)