SRB are very good if stuck in the dark ages (ie you have to phone them up to order! ) they carry just about every kind of filter you can imagine.
or if you want to try eBay Loobylin is is a seller I've used a couple of times now and had very good service from. (9000 sales and still 100% pos feedback is quite a feat) P series size ND filters will cost you 7.99 there.
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