[Rockingham]

(1) Obvious surveillance cameras have a deterrent value, as do motion triggered outdoor security flood lights.

(2) On your budget, Sam's Club has a 4 camera "Night Owl" model with an 8" LCD monitor that looks like a good system.

[PastorBooks]

“Obvious surveillance cameras have a deterrent value...”

I’ve seen fake security cameras for sale that look like the real deal. You can put up a few fakes to be noticeable and hide the real ones.