That is a lot,I’ll be quite honest I haven’t ever ordered anything from outside of the uk before,mainly because you pay your money and left wondering off your item turns up or not,I don’t really know the custom rules on compressed air and duty and so fourth but mikes smith has raised some concerning points.
Everything is a lot cheaper in the states but it’s getting it into the country that costs,for example I’ve been told by a reliable source that if you buy a suitcase full of clothes from the states and take the tags off you will not get charged the duty but if you leave the tags on you will get charged duty,think its a hit and miss situation really,may go well,may not,would be interesting to know how you get on.