If you shop around you can get them for under £20. I've attached a pic which gives you an idea of the padding. It's pretty thick - I've had these since the end of the summer and they're still in good nick. (had to get some new ones after I melted my old endura pair on the pub fireplace - but that's irrelevant!)
My only complaint is that the left one has a small tear in the palm from when I came off rather spectacularly at the end of last year. Not a glove fault, total rider error, but better a hole in the mitt than in me!