Make a non-binding reservation now and keep checking. You're way early for the best discounts. They usually appear in the last three weeks before your trip.
As Richmo said you are looking WAY too early for good deals. Best deals are found closer to your travel dates. I usually book the Tue. before we leave and have gotten great rates the last 4 trips we took. Our rates have been between $95 and $110 for a midsize at Alamo. So keep your eye out on here for discount codes and coupons.