Is there an easy, recent jumping-on point for NF? I'm finding it difficult to buy the earlier books.
Unfortunately, not really, no.
The series does skip ahead three years after Stone And Anvil, so you can think of After The Fall as kind of a second pilot, and if you're trying to jump on late in the game that'd definitely be the one to buy. But I have a suspicion that you'd still be pretty confused.
All the old ones except apparently Martyr (#5) are available as e-books, now, though, if that helps any. And amazon.com has almost all of the old books used for very cheap, too (most are 1 cent!)