As people have already pointed out, per-chip cost is a highly variable number, depending on what design options you pick.
This being said, have another bunch of sample numbers (all US$) for my own set:
View attachment 153865
I should add I didn't exactly go for the cheapest possible options: Some fancy expensive spot patterns on the higher denominations, also shaped inlays (crazy premium!).
Shipping came down to ~$150 per 800ish chips for me; first shipped from the US to the UK where the import is done (cheaper, about 2.5%) and then reshipped from the UK to me. Depending on your location in the UK, you might even be able to save the reshipping cost if you can drive over to David? I'm not sure if he does
that though.
For the period where I was still working on my chip design, I wrote a small Ruby script that would automatically calculate per-chip costs and total cost for my envisioned order given the design configuration and amounts of the chips, so I could quickly see the impact various choices would have on the total cost. I believe in the resources section here, someone uploaded an Excel chart that will do something similar, but I'm not sure.