If you go ikea, get the gerton. It's my understanding this one is quality because it's actually solid wood. https://www.ikea.com/us/en/p/gerton-tabletop-beech-50106773/?gclid=Cj0KCQiAqdP9BRDVARIsAGSZ8AlEEQLWr6CNEtrps1r0yEw7TK8QCXwn65eAgSRzSmKzuef3vNuqZmcaAoRfEALw_wcB

Anything else you get will be a huge gamble unless it's also solid wood (I think they have a bamboo one). If you try to cut it to size, you may find it has a hollow core covered by laminate, at least one of their desktops is, and I bet there are others.

Back in 2016, I bought a Gerton table top and did not notice any smell. I bought another one last month (June 2021) to provide a desk for my daughter and, indeed, it has a very strong smell that triggers allergies and migraine with her. May be because, this time, it came wrapped tightly in a plastic bag within the cardboard box, so that it could not off-gas until unwrapped? I think the smell is from the glue used in assembling that butcher block. As a remedy, we try coating it with polyurethane, hoping that it would seal in the formaldehyde smell, but my daughter is still allergic. So... we'll have to be patient and wait until it finally off-gas on it own. Hopefully, it will not take more than another month.