I'll ask there if nobody has a wifi camera here.
I don't have a wifi, but I do have a $50 game camera. It does what you want, and it isn't a total disaster if it get stolen. The downside is I have to physically take the chip out. Picture quality in daylight is surprisingly good, at night with the IR it's a little grainy.
If I hadn't had it, i would never have caught four raccoons having a party on my deck. My dog didn't even alert. And we're in the middle of town.