Best Cost effective way of fixing shattered iPhone

Hi all

My Mom recently dropped her phone (a short distance at that) and had the front of her iphone4 crack into a few good splits. The phone itself is still completely functionally sound, it just has a shattered glass front. I believe when we went to the apple store they said they could get her a replacement for $150 (or maybe that was AppleCare+?) but that there was another option to send it to iResQ for $90. Can any of you tell me the most cost effective method of getting this screen fixed?

Thank you!