Hackr in the DFW area.
Currently on my 6th lease -> Swapped a couple right on this site 
The first thing i check is for TAX CREDITS. If there are no tax credits then you will never get close to any deal you find here. Doesn’t matter even if you get an additional 5% off MSRP between dealers in Houston/SAT/DFW/AUS but the real game changer is the tax credit.
Based on my posts here and past experiences here is what i can share:
Classic BMW Plano -> Tax credits from June-Aug every year during new model rollout
BMW Dallas - Dec every year to meet annual dealer volume quota
Alfa Romeo of FTW -> Usually all year round - They do jack up the MF horribly tho
Grubbs Infiniti -> First come first served basis - They save the tax credits for people interested in a QX80. If you go looking for a QX30 most prob you wont get it!
If i hear anything more will update this thread!
Happy hackin’