I am in the process of starting my own business selling products and wanted to enquire about your stock levels, if you have a constant flow of your stock? Do your products stay the same or do they change frequently? If I use your shipping service,

We are a 100% stock holding company but we buy from most of the major manufacturers in the industry so we would advise you to use some form of stock managing solution as things do go out of stock.
We can stock manage Opencart, Woocommerce, Shopify and Ebay

https://www.xtrader.co.uk/design/stockmanager.php

https://www.xtrader.co.uk/catalog/ebay.php

https://www.xtrader.co.uk/design/shopify.php

Shipping depends on what service you ask us to use for your orders
https://www.xtrader.co.uk/catalog/delivery.php