Lots of posts about this over the last week.
Rob from SELOC got a set from a chap called Tim Stephens on SELOC in S1 sizes for �350.
Not sure if this was trade / mates rates but the main point is that you should be able to get deals on these as any dealers should be able to get hold of them, not just Lotus dealers as with the LTS AO48’s who will obviously shaft you.
Will try to get some more info from my freindly tyre deale when I can.