Order online is convenient and also safe.
This is Proshow Gold purchase link:
http://www.photodex.com/purchase/store/psg.html
Price: $69.95
Before purchasing, you can download trial version and have a try to evalue it whether suitable for your demands.
Besides Proshow Gold, you can try
DVD Slideshow Builder. The function is same as Proshow Gold, now in promotion only $39.95.