Epay sellers often provide ‘free’ postage for any item. Chronos works that way. That means that a multiple purchase may arrive in one package (with multiple separate postage charges – one for each item – included in the final cost) or in separate shipments (typical of some Chinese suppliers) if the handling of separate items is more cost effective than collecting and repackaging by human labour.
The Chronos website, probably like many others, has a ‘basket’ into which the order is compiled? At the checkout, delivery charges will be addressed, also possibly along with a separate VAT charge. As above, a minimum order value is often necessary to avoid low value orders (costing more than the shelf-picking and packaging costs).
The discerning buyer will take all these facets into account before deciding which route is the better one.
The sellers to really avoid are those that do not actually stock the item, but, promise delivery from the UK – then actually make an order to China and then supply at increased cost with no time saving (been caught by that in the past).