Banana Leaf, Mango Leaves and flowers for poojai ??

I know this response is late for interms of varalakshmi pooja, but just as an general information sake.
I do find mango leaves sometimes during festive days in India Cash n carry, sunnyvale. banana leaf you can probably look in frozen section in indian stores. Also you can check mexican stores for the banana leaves. Flowers for poojai, you can buy bouques from costco or other stores.
HTH,
Revathi