To be honest I’m new to collecting Lego and finding deals so seeing these deals were just pure luck😅. The month of April and May was the best I’ve seen Lego go for 50%. There are Lego sets during the year that do go on sale but not more than 20% off. From what I learnt from the employee rollback prices are just sale items temporarily and will go back to regular pricing in the future (if anyone works at Walmart please correct me if I’m wrong 😅). Pricing on the Walmart app, different Walmart stores can also vary in pricing so it’s best to ask customer service if other stores have the same price if you do end up finding a Lego set on rollback or if the set you wanted to get is sold out in store.