Sorry state side here but maybe you can find this brand down there. This was the one I bought in 2012. I still have it and use it. They make top bearing bits as well, I’m just not sure what you specifically need. The brand is Whiteside and they were recommended by the guitar building circle back in my day.
The one thing about spiral bits is that you need to have the material evacuate in a certain direction. I believe the direction changes for where the bearing is but don’t quote me on that. Make sure you research that.
Also I don’t think you can climb cut with a spiral bit (at least by hand - might be doable by cnc).
I'm in Canada. It's probably $100 US. Here's the link. It's Canadian Amazon but I'm sure the US site has it as well. https://www.amazon.ca/dp/B0012JI870?ref=ppx_pop_mob_ap_share