These might be absolute crap(I don't know), but here's at least one place(assuming you are in the US): http://www.amazon.com/Norman-Neutral-Density-High-Temperature-Filters/dp/B000IU0HZK/ref=pd_bxgy_p_img_y
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I should have been more clear that I didn't mean to always turn off auto ISO whenever manual exposure is being used.
There's some bad advice being given here.
If you use manual exposure, make sure auto ISO is turned off. When auto ISO is turned on, your camera changes the ISO to obtain what it thinks is proper exposure, so all your work with shutter speed and aperture is undone.
you are shooting manual.... so you need to change your shutter speed and or aperture...
Am i the only guy who thinks the canon lens socks are useless? at least the sigma has some real protection and can attach to my belt, and that's my plan for it. i'll keep my samyang 14mm in it, while the sigma 35 is on my cam. then switch out as needed.