If you can, do as Ackee suggested, look for vendors on the street - they will have buckets or boxes of them, often selling them by the bag (like a half-gallon size) for small money. Every day is something/someone different selling.

If you buy Julie, make sure they are firm, not soft; if soft they will be mushy and not so nice.

There are many varieties of mango, your Mom will be in mango heaven!