have a check of ur upper control arm bushes, sounds like it could be them.
if it is them, for polyurethane replacements itll cost about $140 for the bushes itself and about $180 to get them installed. the adjustable to change ur camber on the other hand which would be a better option since ur car is lowered i think goes for about $300 for the bushes not sure about install mite be more and add a wheel alignment to it aswell