You can definitely spend more (or less) on allens, but you won’t do better than Bondhus Balldriver® L-wrenches. I’ve been using them for thirty years and they are pretty much the standard as far as I’m concerned. And they are proudly made in the USA! From the Bondhus About Us page:

Bondhus Corporation is located in Monticello, Minnesota – USA; about 40 minutes from Minneapolis. Bondhus employees are proud of our Company and the tools we make. Our Ball, Hex, and TORX® tools are made in our Monticello manufacturing facility, just across the street from the Mighty Mississippi River.

The set of nine (1.5, 2, 2.5, 3, 4, 5, 6, 8, and 10mm) on the left is available at Amazon.

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