Haggis can often be found online for a pretty high cost, but when in doubt, a nice uncased sausage can work for that recipe. Just brown and crumble it up, and proceed as usual. :)https://twitter.com/DorondirMG/status/950051954272669696 …
While trying to find this for the same recipe I learned that actual, traditional haggis is illegal in the US (though similar products are on Amazon for a hefty enough cost), so this sub was helpful. :) Thank you!