Acrylic Panel Stand Off supplier

[Timja]

Can anyone (possibly in sign making business) recommend a good (cheap) place to purchase stand-offs from for acrylic panels? Need to get hundreds and only places I have found so far seem reasonably expensive.

It's for some display panels we are sending out to customers to have up on a wall and thought having some holes and using the stand offs would make it look quite smart.

Thanks.