A new French solution called Shopping Flux offers great pricing, great support, and plug-and-play ease.
With their out of the box tools you can download free, you can get your website inventory onto their platform with virtually no effort. If you need any changes to the formatting, they are willing to offer bespoke help.
The do not have all the firepower, functionality or resource of ChannelAdvisor. They do not have the customisation of Volo or Linnworks. But they care about their clients, and are growing rapidly. They aren't a good fit for everyone, but they are an excellent fit for many.