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Arrow is not ideal for international shipping. Tried ordering several times, either the order was canceled (for international shipping) or the adjacent fee structure didn’t work for me.
There is a flat fee (approx. 10% for international customs and handling fees) - what nobody tells you is that this fee is for THEIR cost, not for any eventualities on your end. No company abroad can be held liable if you, the buyer, is the importing agent for your goods. Any customs agent from your country or economic region has the right to pull whatever parcel they feel needs pulling.

So if you order an expensive product (say, 100+) you could end up paying 10 bucks to arrow, then any customs liabilities on your end (any VAT or other sales tax i.e. is not handled by Arrow). I specifically asked and they said any local fees from our local government/region is not their liability (besides that 10% would be too low for most country VAT rates anyhow). Also, per-parcel fees like you mentioned are in countries that are not carried by the shipper.

edit:
None of this is Arrows “fault” IMO. They are not an actual consumer facing business, they just allow consumer clients to make orders. When you look at how their web portal is designed you’ll realize they are setup for BOM imports from whatever design software the purchasing department is using.