Buying Yaris - Advice Needed

[mme4]

Hello - I am in the market for a 2009 Yaris 4-Door Hatchback Automatic with standard features + power package.

After shopping around at a couple of Toyota dealerships, the offers I received were as follows (price includes taxes (6%), tags, fees, delivery costs and $1000 rebate):

1. $15,400
2. $15,100

I understand that these prices are under MSRP but considering today's market, are these prices a great deal or should I continue shopping/negotiating? I'd really like to make a decision before the Toyotamarthon rebate ($1000) expires.

Any advice would be greatly appreciated.

Thanks...