The best way to save money on interest is to 1) get a 0% balance transfer card 2) get a 0% purchase credit card and 3) get a credit card consolidation loan (though Payoff, Sofi, or Tally)
We recommend using Honey and Groupon. You can download their browser extensions to get coupons applied directly to your checkout portal when making an online purchase. We also recommend shopping at a bulk grocery store (such as BJ's or Costco) for maximum savings on groceries and household items.