I have a Mossberg 500 and 535, and haven't had any problems with FTF/FTE (of course it's a pump, but ...). Pretty consistent "pops" so it seems as if they have consistent loads and, from what I've seen, aren't dirty. Plus, I like the clear shells; they're pretty.
Good point about the roll vs star crimp, but I haven't had any reduction in tube capacity, at least with the 2 3/4" shells. I don't have any 3" S&B, but that would be something I'll look out for.
I like to check on ammograb every now and then just to see if there are any crazy low deals. A lot of times, the low price offerings are for reloads, or are from sellers that may not have the best reputations (at least from reviews).
A lot of my "stuff" I get on Sportsmansguide (and I swear I'm not shilling for them). When they have a sale, it is usually pretty good, and they have free shipping when you buy relatively small amounts (right now it's at $49). When I buy, it's usually in large amounts, so that's never a problem. And they don't charge sales tax, which is nice. That all adds up.
But get what you can when you can, because you never know how things are going to "develop".