Wire to tie up wire

[Uzoma]

Very often, when you buy some new electrical devices, the cords are tied up with some kind of wire - can that be bought separately & if so where please?

[Harley]

You often find it in packs of freezer bags.It comes in wide strips.

[Jenny Tools]

Garden centres sell a very similar item often called plant ties and they are on a reel you cut to length.