Depends really. Most of them have great b-sides (i.e. "A Little Soul" and "Help the Aged") but they're also available on the deluxe editions of the albums, you might be better off buying them instead if it's b-sides you're after and don't own them already. If you want the original singles then I'd say that isn't too badly priced, they generally go out for about £3-£5 a piece.

He's also selling some stuff such as Pulp Goes to the Disco, the "Pulped" boxset (Is this as good as the new remasters?), and more.