In the Sunday circulars the major stores (Best Buy, Target, Toys R Us, Fry's, etc.) often list games with a little disclaimer "Available */* by * p.m." as a way to entice "impatient" gamers to buy at their stores. (And several times I've gone to stores only to find out that the store clerks can't locate the product and that I should "try back tomorrow."
Target: WiiMotion Plus available 6/9 by 4 pm; Tiger Woods PS3
available 6/9 by 4 pm
Fry's : WiiMotion Plus available 6/9 at 8 am
Toys R Us Tiger Woods & Grand Slam available 6/9 by 5 pm
Basher, looks like your best bet for 6/8 might be GameStop because they often get deliveries late in the afternoon and your game might be in that shipment.