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The cheapest solid core I can find is an $84 Jeld-Wen: https://www.homedepot.com/p/JELD-WEN-32-in-X-80-in-Hardboard...

In contrast, the pieces I mentioned above are $16 ($6 ea. for the MDF, $2 ea. for the 2x4s)

I just had to shop for doors, the only ~$40 doors I could find at home depot were hollow core, like these: https://www.homedepot.com/p/Masonite-30-in-x-80-in-Primed-Sm...

I don't see them on Home Depot's website any more, but they weren't pre-drilled, pre-hung, pre-primed, or mortised for hinges, none of which matter for desk tops, but perhaps that's why they were that cheap. I thought about replacing some of the hollow core doors in my house with them, but I don't trust my ability to install anything more than pre-hung doors. I already had a motorized standing desk, so I wasn't in the market for a cheap desk top, either.

I can buy a desk from Ikea for $40 too, and it even has drawers.