Are you familiar with Microsoft's licensing techniques? You will need a benefactor or a miracle to get a copy cheaply, and even then 'cheap' second-hand MS products carry the risk of being unusable. eBay auctions such as this, for never-used copies, do not usually stay near their starting prices precisely because of the need for the authentication keys that come with the software.

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(60x) 13DT + 3PB + PTPro; (G3) 7DT/MT; (G4) 3T + PB. System 8.1 to OS 10.5.8