a good chunk of them are readily found with the exception of maybe 5-6 that are difficult. Plus quests gives a good bit as well. Most BPs average 10-15fg each. going with the higher end, 1200 is about the max you'll likely get (unless you take up the dude that offered 2.5k)
4k is crazy talk being 3.5x the market price lol
but good luck! my offer stands when no one buys for another 2 weeks