Hi,
See here for a Commodity Code & a rate of Duty - [broken link removed]
No discounts for bulk buying I'm afraid - whatever the rate is, is what it will be whether you buy 1 dollar worth of jeans or 10 mill worth of jeans, the percentage rate remains the same.
When you have the rate of duty for the specific product, (after you have got your commodity code for the product), this must be added to your figure on your sales invoice from your supplier and then VAT must be added to your sales invoice price and your duty total.
For example - 10 pairs of jeans at Usd 100 each, Usd 1000, The rate of duty is 3.5%, Usd 1000 x 3.5% = Usd 1035, multiplied by 21% VAT, Usd 217.35, added together gives you a total of Usd 35 Duty and Usd 217.35 VAT that would be payable.
The Customs & Excise people issue rates of exchange on a monthly basis at which the USD figure will be converted to Eur. their rate not yours !!
Unless you have an account with them (TAN) you will have to lodge this with the customs entry before goods will be cleared and realeased to you.
Let me know if you need any other info.