If it comes USPS/Parcel Force they charge about £8 collection fee, plus VAT and duty on the cost of the purchase and postage. I think import duty is about 3-4%. Occasionally lower value packages go through without charge.
FedEx are a bit pricier on charges. I've found Bax Global very good on larger consignments.
If you shop around in the UK, then the savings are not so great.
I've found DCs to be reasonable quality and robust over the years, but I wouldn't part from my Bose now.