Hello,
If you want to put just price (i mean no other fields in future you can do next).
open includes/classes/rlListings.class.php
find function getListings (for browse pages)
Code:
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you have to make same changes to the rlSearch.class.php - function search if you want the same for search results
make sure that price is the right key of your price field (can be lf_price)
then you can add
Code:
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to templates/your_templates/blocks/listing.tpl