I seen an SVT-40 at a local gunshop last month for $650 IIRC, but decided to pass on it as I'm steering clear of anything that only has corrosive surplus ammo available for it. I also seen one at a gunshow a few weeks ago, and it seems like it was about $900. The same show had at least half a dozen M1 garands under $800.
I haven't priced non-corrosive 7.62x54r for awhile, but unless you want to hassle with cleaning up after corrosive ammo each time you shoot it, you'd be better off with a different caliber.
There's a lot of organizations you can join to order from CMP. I just recently ordered from them for the first time, and sent them a copy of my passport and proof of membership in DAV.
I was leaning real heavy towards an SVT for awhile because it's a cool looking oddball, but there's a lot of better options out there. I ended up with an egyptian hakim to fill my oddball milsurp void (mine turned out being a lemon unfortunately), so you might check those out instead, as they cost about half what an SVT does, are just as cool looking (or ugly, depending on your tastes), have higher capacity mags available for them, and 8mm is comparable to 7.62x54r, if not more powerful depending on the loading. Of course, you still have the same problem of limited parts if you ever need it, and the only surplus ammo is still corrosive, but from what I've read, they're generally more reliable than an SVT.
If you want the SVT for a SHTF rifle or something, there's so many other more modern rifles that would be better suited for it.