Custom & Excise will add 17.5 per cent on top of the cost of the products and its delivery.
Moreover, some components (a few) will not be compatible for the UK or will make it difficult to return if problems arise.
Your best choice is to use
www.microdirect..co.uk and check under “Offers” but generally their prices are one of the cheapest when delivery is also taken in to consideration.
I tend to nowadays shop across Microdirect and
www.ebuyer.com.
The other guys here have already posted my other online retailers.