Some time ago i bought spy pen on dealextreme. After mom took a shover she was dressing in her room and door was open everytime. I did paint spy pen to black(it was chrome) and hide it above cabinet that was on outside of my moms room.
At the time i heard that my mom did go in the shover i did hide the pen and went to my room(after i checked her dildo stash and rub my cock in her bra). After she was dressed and did go to livingroom i grapped my pen and connected it to my pc(my dick was so fucking hard and my heart was racing). I didnt get video of her pussy, but i can see her huge tits in video.
Camera did cost something like 20euros and i was worth it. Later i was able to record other video, but sometimes i just did sneak in right spot, watched my moom getting dressed and played with my dick.
Just buy somekind spy camera and do it. It i fucking awesome feeling when camera is recording own mother and when you realize that the naked woman on your pc screen is your mother...my opinion is that filming my mom and jacking off to that video is better than having sex with random chick.
My english sucks, but i hope you understand what im saying.