How much can I get for a perfectly good iPad 1

There is no resale or trade-in value for that over 11-year old iPad model.

This is a fully unsupported iPad and there are no more available, compatible apps for this old an iPad, any longer.

Either properly recycle this device or keep it as a collector's item.

Sorry.

I doubt you would get much for such an antique. It is too old to run today's apps.. Check this link for Apple trade-in...

Apple Trade In - Apple

You could also try and sell it yourself, but as I say, I can't imagine anyone wanting to buy an out-dated iPad.

That's actually an iPad 2.

While Apple will no longer give you anything for it, they will recycle it.

You may be able to get some money for it though ebay or Craig's list.

Ebay has some for as much as $75 bucks. So someone may be willing to pay that much.

link-> iPad 2 A1395 - Ebay.com

How much can you get for a 16 GB iPad from a decade ago? The adulation of a child that would dearly love to play with and learn from and quite possibly (unintentionally) break this iPad. Or maybe you can find a collector? Or as others have suggested, recycle it.