Shipping prices might be a bit...extravagant.
It shouldn't be too much, his signature mentions pounds so its northern Ireland so should be the same price as shipping to UK, for some tshirts and such it'll only be a couple of dollars.
You might be right about this, it could just be that "Cork" (random place I chose) has high shipping rates $140-160. Pretty insane for a "$35 declared value, 5 pound package".