Lowes has a 7pc Cobalt set 3,4,5,6mm are 1/4"drive 7, 8, 10mm are 3/8" drive. For $26. Or you can buy them individually.
They also have a 6pc Craftsman set 4,5,6mm are 1/4"drive 7, 8, 10mm are 3/8" drive. For $37. Also available individually.
It's rare that you're one to find a "Long Ball Hex" with such a strong drive mechanism like a square drive. Ball ends are typically only are found on tools with limited leverage, like a L key or a T handle.
And anything over 6mm is going to be on something more substantial like a 3/8" drive.
BUT if you really want economical, and have all metric sizes be driven by a 1/4" drive, I'd buy a set of hex shank bits, with a good 1/4" drive to hex shank adapter. (like the
Wera Zyklop Bit Adaptor 1/4" Drive)
Then you can get a cheap set like this:
9PCS 1/4 inch Hex Shank Allen Wrench Drill Bits Set 100mm Metric Tip Socket
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