WooCommerce - WordPress E-commerce Plugin - PHP Shopping Cart

WordPress – PHP Based
    Plugin for Ecommerce – WooCommerce: $0
    Plugin for dynamic pricing: $129
    Plugin for Dynamic Shipping: $69
 
Depending on other features you may be interested in, there may be extra costs for development or plugins.
 
This can be installed on any hosting account; however, VPS or dedicated is recommended for e-commerce accounts for optimal security. VPS Ecommerce also includes your SSL which is required with any e-commerce solution. This is a $48.50/year value.