Will the iPad 2018 model A1893 support iOS 17?

Yes, but not iPadOS 18.

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I cannot recommend buying any used or obsolete Apple products. In about three months, an iPad 6 will be incapable of receiving newer versions of iPadOS.

If you want tosave money, look to Apple's refurbished site:

Refurbished iPad Deals - Apple

The selections change more than daily, so check often.

You have identified an iPad6 (WiFi Only):

Identify your iPad model - Apple Support

While the iPad6 is capable of update to iPadOS 17.x (iPadOS 17.5.1 being current), the iPad6 will not support iPadOS 18.