Hi, welcome to the forums! I can't speak for anyone else, but no, you can't adopt my cockatoo, she's a valued family member. You may have to add another zero to the price you're willing to pay, closer to 2000., I would think. $100. dollars may or may not cover the cost of food for a U2 or a Mollucan for a month. Expect to pay roughly $1000. for a cage and a couple hundred for play stands. Perches and toys will cost you a small fortune, Toos are enthusiastic chewers.
A lot of people who are forced to give up their parrots for various reasons will often ask a rehoming fee, the thought is if you can't afford to buy the bird, you won't be able to care for it.
If you choose to adopt from a rescue, more than likely those Toos will have one or more serious behavioral problems, it requires patience and a skilled trainer to reverse some of these learned behaviors, screaming, biting, attacking, plucking, mutilating. If you do adopt a serious plucker, you can expect the cost of veterinary care to be astronomical. Toos have a reputation for being the most challenging of parrots, there's a reason for that. The commitment is similar to that of adopting a perpetual toddler.
Now that all the unpleasantness is out of the way, why not tell us more about yourself and what other species you're interested in.