It's worth paying I think, only getting the one and they live a few years at least (hopefully!) so really it's not a huge expense, I've spent more on his tank and accessories.
Bernard is now also Alfie, or Alfred.
Showed a photo of him to my little niece, and apparently: "He doesn't like being burnded, he lives in water. He likes Alf".
I figured trying to explain that I don't actually burn him, his name just sounds a bit like that, would be fruitless, so a name change it is!