How to Modify Price Category of Zen-Cart?

How to modify price categories to:  29 Dollar Glasses, 39 Dollar Glasses, 49 Dollar Glasses, 69 Dollar Glasses, and 99 Dollar Glasses, just as www.bestpriceglasses.com?

We should modify the following files:
admin/prodajxdetails.php
admin/seomgmt.php
admin/categories_header_desc.php, modify price related categories header description.
admin/option_metatag.php, modify price related meta tags
includes/modules/left_column.php
includes/modules/meta_tags.php
includes/templates/template_default/templates/tpl_index_product_list.php

At the same time we also should modify price seo related table: prefix_seo_url_1, take care the id arrangement, from small to big id.

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