> 50% cheaper
Hmm, more like 25% cheaper, imo. But I guess it depends what you need to buy and if you go after sales/specials and what not. Aldi does have great prices, for sure.
I still love HEB though. Their bakery section is amazing (especially the fresh warm tortillas), their produce and meat is excellent, and the prices are still pretty good. HEB also has prices online with specific aisle locations for many products (was helpful when looking for frozen yuca/cassava a bit ago).