NBA Commissioner David Stern says Memphis is "looking good on the road to approval" for getting the Vancouver Grizzlies.  Stern and the seven-member relocation committee visited Memphis Tuesday.  The main remaining issue is a big one: approval of a $250 million arena.  Deputy Commissioner Russ Granik says arena financing needs to be "as ironclad as it can be" before the league will give approval.  Some Memphis politicians don't like the fact they're having to move so fast on a large expenditure with too little information.