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Warped discs are very rare (if everything is working as it should be, ie no sticky callipers). It usually is uneven brake pad deposits on discs that can cause the slight vibration through pedal but OP hasn't mentioned that
Yep, metal on metal sound could be there isn't much meat left on...
As Scott's said, you'll have more joy with a proper thread in the right section
You'll also be able to see the marketplace on here if there are any for sale
Well worth being a member for full forum access
Used Renovo products before with good results, cleaned, re coloured (if it needs it) and sealed with their proofer. Took most of a day to allow drying between stages but came up like new and beaded really well when it rained