More than $100 but I have a Panasonic BL C140 IP cam (wired), they are about $175. You can power it down the cat 5 so the wiring is easy and it can be mounted outdoors. You can also extend some USB cams using extenders that use cat 5 cable, but the inexpensive ones are USB 1 and don’t work with all cams.
You might like to take a look through this Topic too; you’ll find quite a few content users of the Panasonic BL C140 there, plus some sample shots, etc.