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Thought I would share this. Not sue if it is regional or not but I have buy one entree get one free.

Find Your Local Sonic Restaurant | Sonic (sonicdrivein.com) [sonicdrivein.com]

The best deal for me seems to be the Buy One Quarter Pound Double get one Free. It comes to $ 3.39 for them both. Don’t forget to customize the free options such as mayo, lettuce, and onion.