Getting Some Work Done Without My Daughter Underfoot

I have the hardest time getting things done around the house since I always have to worry about where my toddler is and what she is getting into. She tends to follow me around a lot. I am thinking that it would be much better for me if I got one of those playpens so that I could get my cleaning and cooking done and know that she was safely playing and not getting into anything dangerous. Can anyone recommend a good place for me to go to get one of these? I don’t want to get one that is too expensive.