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Lowe [lowes.com]‘s has the 30-Piece Set 12-point Standard (SAE) and Metric Combination Standard Combination Wrench Set for $ 19.98. I picked these up for my dad when it was $ 25 during the Christmas sales and thought that was already a pretty good deal.
$ 20 for 30 wrenches with lifetime warranty seems pretty good to me.
This went down to $ 12.49 in February 2021, so it is possible these will continue to fall. However, that price was YMMV, whereas this seems widely available.