200 MSP translates to $3.30, according to the official website.
Crazy Taxi - 200 MSP ($3.30) for Xbox 360 Via Download

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Referral Links
Referral: random (3)
Referee gets free 14 day trial of PC Game Pass.
Each referrer can invite up to 5 friends to a free trial. Invites reset on January 1 each year.
Herp.
http://xbldb.com/offer-history/price-changes/price-decreases