There is a kit called the Sense Starter kit, what sensors are included in that (and how many of each)?
There is a kit called the Sense Contact Sensor kit, what sensors are included in that (and how many of each)?
It’s not listed on the product page
Sense starter kit contains
1 - Bridge (needed for sensors)
2 - Contact Sensors
1 - Motion sensor
Contact sensor kit comtains
4 - Contact sensors
Key point you need the starter kit to get the bridge, after that you can add on more sensors but the bridge which is needed only comes in the starter kit
Welcome to the community, @gmoogle. The products aren’t listed in a text format. However, if you choose one of the three options on the left, the picture on the right changes to show what is included in the kit. It confused me for a bit, too, and I’ll bring it up to Wyze. 
For any Apple users out there, the product photo and video seems to be broken/absent when viewed in Safari (only for Wyze Sense). I’ll report that to Wyze.
Thank you all that answered my question