As to  my own costs, I just went to a nursery and bought 11 plants for around $22. They included a small lime tree, rosemary, lavender, calla lily, pansy, dill.

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antiguaguatemala.unwireme.com/cost-of-living-in-antigua-guatemala-why-you-need-to-buy-in-season/

The Mercado is so huge I get too tired walking around there, but will go next week, at the back in the open air, where they sell roses.

My nice neighbor buys things for me there. I usually go to La Bodegona and sometimes to a smaller grocery.