I just bought cheap ones and put them in a marked pencil case (marked by writing name on sticky label and sticking it on).
A plastic bag of 150 pencils with rubbers on the end cost, I think, £1.50. The case cost £1.
Fountain pen was £2.50 (in a sale, so I bought 3, she's still on the first one).
Coloured pencils cost £3, in another marked pencil case (£1). DD's looks after those ones though!