Not worrying about the fees, we also pay fees for e.g. PayPal. However, using our webshop would mean having everything where it needs to be, with the full monty of invoices, postage, address printing etc. already set up.
We just checked the pre-requisites. We can start at 50 units, which will be the minimum. 100-200 would be our target for the first run.
More details to follow.