PTFE coating small parts in the UK - one offs

I'm looking to get a few small parts PTFE coated to lower friction, max dimension is 80mm, material is aluminium and hardenned steel. I've contacted a few companies and one-offs aren't a big issue, but all seem to charge a minimum of £150, which they claim as being their minimum order. Does anyone know a place, maybe a smaller company, which doesn't have a minimum order value or can simply throw the parts in with a larger batch of other parts?

Regards,
dsc.