With the launch recently of Amazons platform aimed at business only, integration with this platform would be ideal. It's relatively new so I'm sure quite a few people may not have heard of it yet:
In summary you can offer bulk buy pricing, it's B2B only so less likely to have stupid remedial issues with customers. On the other side of the coin if you buy on there, VAT invoices are generated automatically and you won't spend hours chasing invoices.
Have a quick browse below:
please have a read of the following guides in the Linnworks documentation which you may find useful
Head of Implementation