Every time I buy bedding from Argos they go and drop the bloomin prices again. Luckily for me this Owl Children's Bedding Set is a single and I bought toddler size, but £4.99 is a hell of a good price for a single duvet cover set.
The Owls Single Bedding Set is a multicoloured children's duvet cover and matching pillow case in pinks and purples. It's also reversible so if you fancy a change you can flip it to show the pink with polka dot side instead.
I didn't see this a couple of days ago when I was looking at bedding, so I have no idea where the "was £9.99" comes from as I don't recall having seen it before at all. It's still a great price for a bed set, and this one is a polyester cotton mix, machine washable and can be tumble dried.
If you don't like this design then there are several others starting at £4.99 for single sizes* as well.
There are stocks in every single store as far as I can see, so you should have no problems getting one on reserve and collect, or delivered to your home for an extra £3.95 if you aren't near a store.