Window Companies Selling Mini-blinds & Window Coverings

I was wondering if any of the other window companies on this site sell window coverings? It seems like a fair percentage of my clients want new window coverings for their new windows. I got a call a few weeks ago from a company that will set me up with the sales stuff or I can refer the job to them---I deleted the message by mistake.

On one hand I think it is a crime to hide my windows behind mini-blinds or any other "window covering. On the other hand I would like to assist my clients with their add on products.