What's up!
I just started P90X and I like the dumbbells better...it's always good to switch it up...but I feel more of a burn with DB...I'm not sure how much P90X goes for on their site, but I got mine from QVC for $129. I tried to get one from ebay, but always seemed to get outbid.
http://www.qvc.com/qsearch/search.aspx
you should also get a chin up bar...that is key. If you don't want to drill holes in your house...I got the door gym...it's awesome...no drilling and I found it the cheapest for $39.95 with $3.00 shipping here. It works great..
http://www.karatedepot.com/tr-ex-25.html
I just bought some dumbbells at Kmart and they had pretty good prices, but they only sell up to 25lbs (which works for me since I'm a chick).
The food...someone did a review on here...which should give you some more info, but if you have any more questions just ask and I will do my best to get back to you.
http://www.weightloss-hq.biz/exercise-reviews/p90x-nutrition-plan.html
Okay I think I took up enough space in your thread for now
Best of luck...peace...