I bought these a few years ago and forgot the supplier.

I am looking for a stick-on to put onto the front part of the sole of
my stilettos to make it rough and not slippey, rather than rubbing
them against concrete and wearing out the sole of my shoe.

I recall I bought them at equivalent to around US$2 for a pair via a
mail order catalogue in Australia, and have not been able to find them
since.

I need to buy either via an Australian supplier, or via credit
overseas purchase. The cost should be no more than US$4 for a pair of
shoes.