@anon25636 - Asking of there's an alternative to lardo is akin to culinary blasphemy! I suppose if a recipe calls for it to be untreated then backfat may do. But seriously, it is a speciality product that can't be equalled.
Lots of places sell it online these days, so you should be able to buy lardo quite easily. If you live near an Italian neighborhood then it will be even easier.