Are you looking for molds to make your own pavers or for stamps to imprint a pattern in fresh poured concrete. Or those walkway patterns you pour into like forms and then remove when the concrete begins to set?
I agree with Joe. I don't see how you can make your own concrete pavers cheaper than you can buy the things. Do check with a landscape yard and supplier as they are likely to have better quality ones than a box store.
If you are thinking of stamping a pour? If you plan to color and stain and do a large area you will need multiple stamps and there really is an art to it. I would call an artisan if this is for a patio or something. Perhaps a DIYer could pull off a walkway in sections. Make sure you form to match the stamps.
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