But Farnell are not a supermarket, and do not sell in those volumes or at profit margins where where they can absorb CC costs.
supermarkets with huge numbers of purchases can even things out.
They probably make a loss if you use a credit card to buy a £2 item, but it is outweighed by the volume of transactions, most of which are for much larger sums, so they probably get a bulk discount.
Credit card companies charge money for transactions, plus monthly charges. Creating an account for a single purchase costs money too. Add to that the amount of online fraud that takes place, (people using cloned cards, bogus addresses, etc) a minimum order value of £20 is not bad.
Purchasing a £2 item online would probably incur more than 50p in CC charges.
Paypal charges, but not as much for obvious reasons, and it takes care of the authentication.
We are used to "free" bank accounts, credit card transactions, etc, but there is no such thing. It has a cost at some point, and you pay for it one way or another.
The sig between the asterisks is so cool that only REALLY COOL people can even see it!