I don’t know what good it does to list one premium gin, bourbon or rum for comparison, but if that’s the exercise, here are my picks (expensive one on left, comparable alternative on right):
Gin: Tanqueray vs Seagrams Distillers Reserve Gin
Bourbon: Maker’s Mark vs. Evan Williams
White rum: 10 Cane vs. Cruzan White
Silver Tequila: Herradura Silver vs. Sauza Blue Silver.
Generally speaking, just go to the liquor store, and look in a category. There’ll be the one you recognize, and a bunch of knock-offs for less money. Whether or not they’re worth that money is up to you. For example, I woudn’t call any DeKuyper curacao or triple sec product comparable to Cointreau. Luxardo Triplum… maybe, Combier Triple Sec, sure, but not DeKuyper or Hiram Walker.