vHello,
My name is Olga, I represent not big software development team in Ukraine.
Our current portfolio includes a lot of intelligent solutions developed for clients in the US, Canada, the UK, Germany Israel etc.
We can create script, which import data from MySQL tables directly in to Magento MySQL tables according to your requirements.
To be more precise, I suppose we need a little bit more information. It would be great if you can appoint time to chat via Skype (or whatever means you would prefer).
Please let me know when you are available to discuss in more detail?
Best Regards,
Olga Bogatska.