can you use a changing pad for a co sleeper

Hillary
I was wondering if one of these would serve as good as a co sleeper pillow? 
The ones I've seen are like 160 dollars for a flippen rounded pillow thing and I'm not spending that much after I have spent so much on crib, play pin etc. 
I just need something to put him in on my bed so I can be next to him. 
I used to sleep with my daughter on my chest, but everyone always says how bad that is. So would this work ? 
My husband and I are both very light sleepers and have a king sized bed so he will have a huge area in the middle of the bed. No worries of us rolling on top of him