STBX does sell flavored coffees, are you taking about the syrups you can get?
Adding syrup to coffee really isn’t a cup of coffee but instead a coffee drink.
Seriously, Starbucks is hugely overrated. I've found that some of the best coffees are often found at the convenience stores at gas stations. I can go into my local Kelly's Market (Mobil gas dealer) and get a 32 oz. mug of fresh brewed coffee for $0.69+tax. I got the large cup with my first coffee purchase some years ago. I bring in the empty cup and they ring it up as a refill. They specialize in Kona coffee.