Zen Cart Version 1.5.1

I am not sure if this going to be simple or more complicated.
What I wanted to do is to have attributes that have $0 to show certain wording.

I wanted attributes to look similar to eMed Hospital Beds site.
http://www.emedhospitalbeds.com/inva...e&utm_term=561

Currently, this is how attributes look...

http://homepromedical.com/cart/beds-...-bed-p-65.html

No Bed Rails
Invacare Reduced Gap Full-length Bed Rail [6629]
Invacare Reduced Gap Half-Length Bed Rail [6630]

However, I do wanted to be like...

No Bed Rails
Invacare Reduced Gap Full-length Bed Rail [6629] (FREE!)
Invacare Reduced Gap Half-Length Bed Rail [6630] (FREE!)

However, I do not really want to be like...

No Bed Rails (FREE!)
Invacare Reduced Gap Full-length Bed Rail [6629] (FREE!)
Invacare Reduced Gap Half-Length Bed Rail [6630] (FREE!)

I don't want the word "FREE!" showing up on attribute that add no accessories at all.

I'm not sure how complicated to set that up. I don't think I can do that via admin panel.

Sincerely, PanZC2020 (April 2nd, 2015)