If you aren't looking for a specific BOGO bundle, you can use active promo codes to reduce the price of standalone sets.
Industrial suppliers like MSC Industrial Supply offer "Bonus Value" bundles where a secondary tool set is included with your primary purchase. gearwrench buy one get one
: A 4-piece 90T Flex Head Teardrop Ratchet Set often comes with a Bonus Socket Set (estimated $67 bonus value). Wrench & Bolt Biter Sets : Select 120T XP Teardrop Ratchet Wrench Sets include a Bonus Bolt Biter Set Go to product viewer dialog for this item. (estimated $79 bonus value). If you aren't looking for a specific BOGO