Walmart finally launched its long-promised membership program last week.And it's basically their own in-house version of Amazon Prime. .Walmart+ will be available from September 15th, for $98-per-year or $12.95-per-month.Members will receive unlimited free delivery from Walmart stores, including same-day delivery, where available. .Members can also use Scan & Go, which allows them to scan all of their items while they're still shopping.Walmart+ members also save "up to 5 cents a gallon" when they buy their gas at Walmart.