He's gonna kill me, I kinda hope he does... Options

[Haruka]

First of all, i live in Bolivia, and original stuff is expensive.

Ok well i have this friend. I don't like him very much becaue he always follows me around (i'm the loner in my school) and people always make jokes about us going out and whistling when they see us together. The only solution i could come up with is just act cold towards him because I feel as if he's just follows me because he feels sorry for me and stuff....
Well, like 2 weeks ago, i borrowed 2 CDs from him, but the thing is that i lost one of them (or it got stolen ) and i've been telling him that i forget it alot, then, i told him it got stuck in my CD player that needs electricity to eject, but now it's just a matter of time before he finds out. The good thing is that i have 3 weeks to find out what to do (because it's winter vacation here in bolivia)
I WOULD buy him a new CD, but i don't have enough money to do anything. His CD was an original from the US, and here it would be like $15-20 US, but for me that's really expensive because $1 US = 7.90 bs$ so that's anywhere between 118.5 bs$ and 158 bs$!!!
Should i tell him and try to buy the original or should i buy a copy that looks like the original?? (if one even exists!!! )