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Money cheat
In Career mode take your boxer to #2 in the rankings and save your game. Then win the last fight(s) which are usually worth $100,000 plus. Do NOT save the game after the end movie. Spend all your hard fought winnings in the shop and DO save all the unlocked characters/venues.
You can then reload your saved game and play the just the final money winning fight(s) again. All the characters/venues remain unlocked from before and you now have oodles of cash to spend in the shop once more.