If you already own an iPad there may not be a need to purchase a new one. Apple has confirmed that when iOS 13 is released in September 2019, it will only run on iPad Air 2 or newer.
iPad Requirements and Recommendations
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Required

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Recommended

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Already own |
iPad Air 2 or newer with at least 32 GB storage |
iPad Air 2 or newer with 32 GB or more storage. |
Buying a new one |
iPad or iPad Pro with 32 GB storage |
iPad or iPad Pro with 32 GB or more storage. |
Refurbished iPads with a one-year warranty can be purchased directly from Apple.