To add to this clarification, the reason is that the power tools from one company typically have interchangeable battery packs, therefore if you have purchased a few full sets with battery and charger, often you do not need more, therefore tools can be purchased "body only".

Here is an example: https://www.homedepot.com/p/RYOBI-ONE-HP-18V-Brushless-Cordl...

Edit: GP asked for link to tool that costs similar to an iPhone that is body only, here's one priced at $2500: https://www.homedepot.com/p/Makita-18V-LXT-Lithium-Ion-Cordl...