Well, predicting future discontinuations requires a better crystal ball than the one I have. Fujifilm is particularly inscrutable.
Velvia sheet film is in fact not discontinued (near as I can tell), but Velvia 50 hasn't been sold fresh in the US since about 2012. Velvia 100 and Provia 100F sheet film continue to be available in the US through retailers like
http://www.badgergraphic.com (and the big guys like Adorama and BHPhotovideo). Fresh stock of Velvia 50 (and others) is available from Japan, either through Ebayers as you noted, or through places such as Japan Exposures
http://www.japanexposures.com/shop/f...1¤cy=USD. Last year a member here (StoneNYC) organized a bulk buy from a Japanese reseller at a good price - not sure if he is still doing that.
As far as alternatives for landscape photography goes, many folks use Kodak Ektar 100 color negative film.
You can do what I do: stock up now and freeze it for future use - this has the added advantage of keeping it from the hoarders
I think you will enjoy shooting large format film. I also moved over from digital and haven't looked back. But the general advice is to start "slow" - i.e. not the most expensive camera at the start. Put your money in lenses at first. After shooting for a while you will have a better idea what you prefer in a camera, and you can resell your starter camera and get the "ideal" one.
Hope this helps.
Bob
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