I must first say, you flash a CDMA phone to cricket. In general "unlocking" a phone is usually for a GSM phone. As for what a store near you can do, that question would best be asked to them directly. Because of the following:
A: You failed to mention where your at.
B: You failed to mention the store name location, etc.
Now if you want to list your phones, Manufacturer model and original carrier we can tell you if they can be flashed to cricket and how easily.