50g is 80 metres, which is 87 yards, and the post is 28 Euros post, or 68 Euro "Interlink" which is I think an independent courier company
so of you bought a pack of twenty 50g balls (1740 yards) and went for the cheapest postage option it would be 82 Euros, and that is around $107 at the minute. Now I think that's expensive!
Over here some shops also sell it in 200g hanks which are cheaper, and I think that there is someone on Ebay who sells them to the US
( I think karlefr and Ceol-Deas are two ebay sellers who have it).
Kerry Woollen mills
also do their own wool, but it's not tweed, it's 3 ply aran and it's E6.28per 200g hank