Please send me a PM when this happens. It’s prohibited, and will result in an immediate ban of the account, as explained in the rules for commercial sellers:
http://budgetlightforum.com/forum/misc/commercial

The only exception is that occasionally a company contacts me first requesting reviewers of free samples. In that case I usually give them permission to contact a few reviewers of their choice. But to simply offer a new product without the user having requested a PM notification is completely prohibited.