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If it's bidding, Sea vs WSN -
Then the Mariners, at that point, should simply outbid Washington. That's not asking too much.
As many have pointed out, it can be a long time between Prince Fielders, and the options are liable to cost you some serious minors talent.
We ain't talking about NYY vs Sea. If it comes down to the Nats and us, then pay the man. You don't always have to get a discount, to make a purchase.