It seems they do not bother to increase a minimum order size, cannot say same for listing prices
Mouser:FREE SHIPPING
on most orders over £33 GBP, 50€ EUR or $60 USD**
Digi-Key:GBP Shipping
Free delivery to United Kingdom on orders of £33.00 or more. A delivery charge of £12.00 will be billed on all orders less than £33.00.
Incoterms: DDP (Duty and customs paid by Digi-Key)
USD Shipping
Free delivery to United Kingdom on orders of $50.00 or more. A delivery charge of $18.00 will be billed on all orders less than $50.00.
P.S.
It would be great to buy $60 cash for £33... ok, just $50 would be fine too