Which works best?

My LO is 11 weeks and sleeps well in his crib, however around 7am he wants to finish out his last hour or so of sleep in our bed. My fiance is a very big man 6'3 and 275, and a heavy sleeper so I do not want my LO in bed between us but also dont want him on my opposite side where he is able to fall off the side. I wanted to get a co sleeper that just goes on my side. Any recommendations?? I really dont want to be spending a lot of money on a fancy one either. Thank you everyone!