You could also give pre-mixed cocktails instead of infused bourbon. Try a negroni (1/3 gin, 1/3 sweet vermouth, 1/3 Campari) or it’s cousin, the boulevardier (replace the gin in the negroni with your whiskey of choice).
Assuming that you give 12 oz. of cocktails per gift, you should be able to get away with about $8 per, plus the cost of jars.
Other cocktails that don’t feature three liquors should be even cheaper (martinis, manhattans, old fashioneds, sazeracs, etc.) though you’d probably want to up the quality of the base alcohol and give a jar of the requisite garnishes on the side (some kind of fun stuffed olive or pickled veg, or good amarena/maraschino cherries, etc.)