HOW MUCH CHEAPER are house-brand products than their name-brand counterparts at your grocery store? To get an idea, in June, we had reporters in three cities price a 32-item shopping list two ways: once with nationally known brands and once with the store’s private-label alternative, if both were available. (Turns out only 19 products came in both name- and store-brand versions at all three stores.) Here’s what we found at an Albertsons in Las Vegas, a Giant outside of Baltimore and an H-E-B in Austin, Texas.