Vegetable plants - where to buy?

I want to grow a few basic veggies (tomato, pepper, cucumber) in pots on the sunny side of our place and flowers on the not-so-sunny side.

Is there a vendor at or around the mercado who sells veg and flower plants? I know there are wonderful nurseries outside of town but I only need a few basic things.

If you know of a vendor, please steer me to the location.

Many thanks