As you know, the default storage available in SharePoint Online is given by the following formula: 10 GB + 500 MB per User. If this default storage is not enough for our business requirements, we have the possibility to by extra storage. However, in order to be able to buy extra storage we have to check if our Office subscription is eligible for SharePoint Online storage: https://support.office.com/en-US/Article/Change-storage-space-for-your-subscription-96ea3533-de64-4b01-839a-c560875a662c#__is_my_plan. As you can see in the previous support page, you can buy extra SharePoint Online storage as long as you have one of the following Office 365 plans:
SharePoint Online storage is available for the following subscriptions:
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Office 365 Enterprise E1
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Office 365 Enterprise E2
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Office 365 Enterprise E3
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Office 365 Enterprise E3 for Symphony
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Office 365 Enterprise E4
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Office 365 Midsize Business
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Office Online with SharePoint Plan 1
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Office Online with SharePoint Plan 2
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SharePoint Online (Plan 1)
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SharePoint Online (Plan 2)
SharePoint Online Storage for Small Business is available for the following subscriptions:
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Office 365 (Plan P1)
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Office 365 Small Business Premium
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Office 365 Small Business