Can someone recommend a decent flanger pedal that i could probably get off ebay or craigslist used for less than 50$?
You're gonna want to up your budget if you want anything decent.
I have a Digitech Turbo Flange I used to use, it sounded pretty sweet, liked it a lot... I actually missed it when I upgraded to my Carl Martin classic flange, even though it's such a better pedal
Might get a used MXR 117 for that if you're lucky.