Got an LPI quad bribe at Philadelphia Station in Penn. One from the bartender, and then from the 3 LPI visitors.
Got an RFP quad bribe at Planet New Berlin. Room was full of Rheinland corps at the time.
I have gotten BPA triple bribe at New London, but have not gotten a quad bribe there yet althought it should be possible. The guide says go to Sheffield in Manchester, but I find New London to be easier since there are more corps there (such as Planetform).
One bug in the Guide now, for Rheinland Military it says Fly to Altenburg, Dresden and take missions in 4C. That base only offers 1-2 missions at a time now so its very hard to rep up. The battleship in Stuttgart is better now, it offers a good variety of missions, none are super easy but they aren't very hard either, and always plenty of them.