hey guys, when i'm braking i get some vibration from the car which can be pretty violent. if i apply more pressure though the shaking goes away. does this mean that my rotors are warped?

if so, suggestions on where to get stock/good rotors/pads for cheap appreciated! i browsed alloembmwparts.com and there were a bunch of similarly priced brake pads, not sure if any are better than the pack? thanks for any info!