This company is very good. But tend now to be a bit more expensive than some on eBay. y
https://www.eezytrade.co.uk/
Rarely do we use the same amount of ink of each colour.
With them, you don't have to buy the advertised complete sets.
You can have, say, two of one colour and none of another colour, of which you have enough. They'll do any combination. It's cheaper than buying individual carts.
You just have to email or phone your order. The guy who runs it gave me the code to over-ride the message on my Epson stylus photo.