Adding up the cost of all the ingredients in the link you provided would run about ฿700 (Tops had everything but the lardons on their site so I just ballparked ฿1000/kg for decent ham). More expensive than I would have thought.
Still…almost ฿1800 is pretty pricy and I’ll bet that there is nothing imported about it (as many posters seem to believe) because if it was imported, it would have the little flag/country of origin next to it as they do on (probably) every imported product in all the major higher end supermarkets.