You could, perhaps, fluke a cheaper copy somewhere else, but as a plain old reliable source, eBay is hard to pass by.

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Addendum: Office 98 has min. requirement of PowerPC processor, System 7.5.2, 16MB and VM on, 80-150MB of HDD space. It runs quite as snappily in Classic Mode as under OS 9.2.2, but it is still a Microsoft app. Office 2001 probably does at least as well as far as OS support goes, but some seller on eBay may display/tell you its system requirements.
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(60x) 13DT + 3PB + PTPro; (G3) 7DT/MT; (G4) 3T + PB. System 8.1 to OS 10.5.8