Bought a couple new appliances recently, financed them on a 24-month deferred interest plan. I want to set aside enough money each month to exceed the payoff balance by the time the deferred interest promo expires. My brokerage (E\*TRADE) has an automatic investing feature that allows a scheduled purchase of one of the supported ETFs in small amounts. Looking at putting $120 every two weeks into SPLG as that's a S&P500 fund that I hold in my IRA with a low expense ratio.
Also thought about TBIL but I think that has a bigger tax impact because of the dividends.
Obviously there's always a savings account, but an S&P500 fund historically yields way more than that.