Hi all, found this website about solar scope building.
http://www.considine.net/dgroski/And the ebay page with the filters etc on it, all looks very interesting.
http://stores.ebay.com/BJOMEJAG-EBUYER-STORE/Astronomical-FIlters-/_i.html?_nkw=&submit=Search&_fsub=2&_sid=8343593Optical Interference Filter 656.3 H Alpha 0.1nm Pair for $225 (about £130gbp) + shipping.
And if your building a Rover Mars lander he has filters for them aswell....
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