It's never been so easy or affordable to sell products online. Products can have multiple choices, use image galleries as choices or even be combined with contact forms to get customised information from your customers.
You can create email templates which get automatically sent to your customers, not only when they place their order, but also when you dispatch it.
You can also export your oder data in CSV format to use in your spreadsheet application.
SetSeed has full stock control built in. Simply set your initial stock level and then as items are sold their stock level reduces. When items are out of stock, customers are clearly notified before they add a product to their basket.