Hero Journey teacher waxes eloquent on her ARthurian references and resources
the amtter of britain page: has pop culture stuff for king arthur
these are the stories I read as a kid: now very dated but could help you pick a few. they could do them in lit circles? one story per group? lancelot and guinevere, the green knight, holy grail, tristan and iseult--there are movie for almost all of these!!