Where can I find proper hair slides?

Amazon seem to sell everything. Worth a try.

Accessorize ?

I would also go to Accessorise they sell the tortoise shell ones all different sizes.

Superdrug have a selection usually

Thank you all. I've found the Accessorize slides, Glammanana and have asked them about the fastening. They look ideal. Not looked at Superdrug yet, Lindylo, but will do.
Appreciate your help.

G489 The ones I have are about 2/3 inches long and have a snap fastener on the back,I also pick them up when I am abroad you can get some really pretty ones in the craft markets.

Boots have a selection of tortoiseshell and black hair slides, probably different ones too but I was only looking for that type.

Claire’s Accessories and Primark are good as well.

The only slides which stay put for me are the 'beak' shaped crocodile clips. There are lots on Ebay, but check the size as some are huge.

I just wanted to say that when I was growing out part of my fringe I found a headband very useful. I got them from boots. Thinking of growing out the rest of my fringe so it will be back to the headbands!