Walmart has the 3-Pack Hyper Tough Folding Hex Key Set (SAE, Metric, and Star) on sale for $5 with free shipping with Walmart+ (30-day trial) or on $35+. Sizes include:

• SAE: 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, and 1/4-inch
• MM: 1.5, 2, 2.5, 3, 4, 5, 6, and 8mm
• Star: T-9, T-10, T-15, T-20, T-25, T-27, T-30 and T-40