i would put that money towards a trainer.
we loved it, and my trainer was all pumped up about me losing weight when my husband and i bought and shared one. it was fun. however, i stopped seeing her because she was also a nutritionist, and she began to ask how i was dieting as well. i told her atkins and she flipped!

she was seriously concerned for my health (i understand) and she started guilting me saying - you are a healthcare professional, you should know better. stuff like that. so i tried to do what she said diet wise, and guess what - of course the weight piled back on. so i ended up stopping going. i really liked her, i'll be honest, but the fact that she wasn't supportive of my diet did make it more difficult on me. she let me know, that was for sure. i have to say that i think she did that out of sheer concern. so i'll defend her on that. she was never mean or rude about it, and she was a good trainer too.
my advice is to find someone who is supportive of your diet - your bypass or your band. i would think that would be really easy. the goal is for them to be really supportive and motivational.