How do I convince my parents to let me get an palate expander?

[alexias]

i tried so much times trying to nag them and they told me that its "too" expensive, i know for a fact they got 600k sitting in the bank, any ideas how i could, gonna be turning 18 in some months so i dont wanna get sarpe

 

[ZygoSmasher0]

Try guilt tripping them for being stingy