OP, is this for high school graduation or college graduation? Also, the way you explained it, did you all purchase the house together? Seems kinda weird that you would know quite a bit about their finances. My parents wouldn't even tell me how much their house cost, and i am 30

(i looked at a flier from a house down the street that was for sale - most likely foreclosed on - to get an idea.. not that i give a rats' ass)
In any case, it does seem kind of weird that they pull in decent money, but can't shell out 2K. Why not just save for 2 months or whatever and then pay cashola? You NEED it right away? They can order it and have it sent to you.