There are still good choices for black and white in 5x7, but I think that currently there may be no new colour films available. Also, film holders are currently very scarce, and as a result fetch strong prices when they do show up. Oddly, 10x8 holders are a lot easier to find and there is more film choice. Go check www.largeformatphotography.info for a discussion on the merits of 5x7. It links to a Q&A forum, where you'll see a lot of recent angst over film holders.