That's ridiculous indeed , Air filter can be found below 10$ also ,It absolutely seems they want to ripp you off,,I think you can show them any receipt you have that you spent money for that place ,Tell them you didn't knew or you didn't find in that lease you signed that they were going to charge all these ??, Main thing is  tell them frankly you can't loose that much amount as you are student and that you don't have job at the moment or so, you were depending on that amount you were going to get back , try to tell them you can't loose more than 100 or 150  and try to bargain. And Yes always try to find before hand when you move to any new place and you can even put your points in writing when signing the lease ,how much they are going to charge for cleaning ,paint and so on ,and yes taking PICTURES is also important ,always take picture of the place ,windows bathroom paints floor ceilings so that you can have that as your proof later on if they try to say you did this and that , don't believe anything what they say ,these people are one of the worst liar i've seen also .Be careful bro.