Wanting elliptical or treadmill

I've been considering on buying either treadmill or elliptical, however, i can't find anything that suit for my budget as of this moment. I prefer pre-owned excellent condition rather than the brand new as they are a way cheaper. I kept on reading at some forums in our local areas because i've seen few people are selling their stuff-out but I just have no luck on elliptical or treadmills as they went gone so fast. I guess a lot of people will be wanting them specially that summer is inching closer.
As for myself, i have to be physically fit. I need to get rid of my bulging fats built-in during the holiday seasons because they are just so embarrassing. I am planning a pool party for Alyssa's bday on July, hopefully i reach the goal before then.