That's where I got mine from. Really expensive!!
£100 for half a litre.
So I got spray cans. One primer, one colour, one laquer....£60!
That was enough for one panel, and it chips very easily now.
For such a small area, you might be better going for a contrasting colour. Black or silver would look good maybe.
Then ask a car bodywork shop nicely if they would use excess paint from another job.