30 SAM goods will give you all the goods you need to build Alcatraz, CDM, COa, and statue of hue and have about 500-1000 goods each to run GBG or GE it's crazy. Only problem is the patience needed to trade down that many goods but it's possible and very rewarding early on.
yeah, I buy SAAB and trade down.
1 SC set traded down = 64 Arc sets.
SC price on my world is 500, and arc sets are sold for 250-400 (noobs often overpay to get an arc because they get it before they know what they are doing, I did that btw)
so with enough customers and time, you could turn 500 FPs into 16,000-25,000 FPs.
Perhaps on a brand new world, buying FE and selling PE would be good?