Walmart has the 16-Piece Hyper Tough Hex Key Set (SAE and Metric; TW40044Z) for $3.38 with free shipping with Walmart+ (30-day trial) or on $35+. Sizes include:

• SAE: 1/16, 5/64, 3/32, 1/8, 5/32, 3/16, 7/32 and 1/4"
• Metric: 1.5, 2, 2.5, 3, 4, 5, 5.5 and 6mm