I find caramel bits at Target and Walmart in the baking section.
If you cannot find caramel bits, you can use unwrapped and chopped Rolos or Hershey’s Caramel Kisses.
For an easy topping, skip using caramel bits and chocolate. Instead, just top hot brownies with a Roll and then squish the Rolo with a pecan once it melts (like thesepeanut butter cookies).