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Paved courtyard

Hi, I have a paved courtyard that is essentially a weed pit. It has paving stones but gets a lot of weeds in the cracks. Someone recommended getting polymeric sand put in between the pavers so I'd like to get a quote for that, or any other ideas for how to manage this. The photos are of its existing state, I've weed sprayed and am just starting to pull weeds. I expect to spray again which will buy me a month or two, so I'm really looking for a longer term solution. Cheers