For the record, I suppose we should get a list of FLASHPOINT books so we can figure out where we might see Booster.
From DC's
PDF FLASHPOINT checklist part 1 (covering books shipping through June).
May:
FLASHPOINT #1
BOOSTER GOLD #44 (I'm sure there's Booster in this one.)
June:
FLASHPOINT #2
FLASHPOINT: BATMAN - KNIGHT OF VENGEANCE #1 (of 3)
FLASHPOINT: SECRET 7 #1 (of 3)
FLASHPOINT: ABIN SUR - THE GREEN LANTERN #1 (of 3)
FLASHPOINT: WORLD OF FLASHPOINT #1 (of 3)
FLASHPOINT: EMPEROR AQUAMAN #1 (of 3)
FLASHPOINT: DEATHSTROKE AND THE CURSE OF THE RAVAGER #1 (of 3)
FLASHPOINT: FRANKENSTEIN & THE CREATURES OF THE UNKNOWN #1 (of 3)
FLASHPOINT: CITIZEN COLD #1 (of 3)
BOOSTER GOLD #45 (I suspect Booster is in this one, too.)
FLASHPOINT: WONDER WOMAN AND THE FURIES #1 (of 3)
FLASHPOINT: DEADMAN AND THE FLYING GRAYSONS #1 (of 3)
FLASHPOINT: LEGION OF DOOM #1 (of 3)
FLASHPOINT: GRODD OF WAR #1 (Seriously? This isn't a title, it's a punchline.)
FLASHPOINT: LOIS LANE AND THE RESISTANCE #1 (of 3)
FLASHPOINT: THE OUTSIDER #1 (of 3)
FLASHPOINT: KID FLASH LOST #1 (of 3)
FLASHPOINT: REVERSE FLASH #1 (Seems like this one is a possibility for some Booster given the fact that the two butted heads in TM:VP.)
FLASHPOINT: PROJECT SUPERMAN #1 (of 3)
FLASHPOINT: GREEN ARROW INDUSTRIES #1
FLASHPOINT: HAL JORDAN #1 (of 3)
FLASHPOINT: THE CANTERBURY CRICKET #1 (When DC debuted this character design on April 1, I thought it was an April Fools Day prank.)
If you're in it for the long haul, that's $73.76 worth of comics in two months. Before taxes. For just the first part of this "epic" story.