There are a selection of these on Amazon.com, look like one generic manufacturer with different badging, do a search for
"bluetooth keyboard with touchpad slot"
Same search criteria on Ebay gives similar results
If you are going to be using it out of office and looking to save space, I have used the folding keypad/touchpad before, generally good for knocking out emails etc
https://www.ebay.com/itm/Mini-Tri-Fo...XnfsR2WBztBT1Q