You can find Japanese braid that's very good and cheap on eBay, but the problem is it's now often packaged and shipped from China and you never know what you're going to get. I have a 1000M spool of 50# that is a little thicker than 50# PP but beats it every time in a break test. I've spooled my cod and bait jigging rods with it and used them last year without problems. I just spooled some bass trolling rods with it.
Of course PP kind of sucks, so take that comparison for what it's worth.