ibecarly

I have a 2005, AWD Lexus RX330. I am the first owner, only 30k miles on it. Always serviced at the Lexus dealership in the suburbs of Illinois. My boyfriend, who is 6'5, knocked the pop-out cup holder as he was getting out of the car. The cup-holder itself is there, but the bottom part is broken off so nothing can be put in the cup holder without it falling through. How do I go about fixing this, is it a home repair or do I have to bring it in? Where can I find parts? If I have to bring it in, perhaps how much would it cost? It's just plastic so I'm hoping it won't cost much but I do not know much about cars and how much work it may be. Thanks to all!