Most installations are for my osCommerce software are $90 per product. If you forgot to check the "Installation" checkbox when buying the software, you can buy installation by buying this product.
Please note that my prices for installation are for my mods only. I do not install third party mods unless you are a client who is on support. Prices for installations on platforms other than Zen Cart are generally higher. Please also note that the scope of work on mod installation is limited - for example, osCommerce mod installation does not include payment module rework, which is extra if required.