I dropped the watch on a tile floor. Shattered the crystal. Needs relacement.

Closing the back can be very difficult.
I once squeezed the back on a watch and wasn't careful - shattered the crystal :[
Take it to a jeweler and have them do it for you.

In case service center is telling that they don't have glass for your watch then tell them that you are going to approach the HQs of casio and complain regarding this service center that they are not keeping parts for most of the products. This trick works most of the time. Secondly, you can contact any of the local glass experts in your city alongwith your watch. They can measure and cut out a piece of glass for your watch or also you can contact any of local watch maker who can check out if he has any glass piece measuring the same size.

take it to your jewelry store, they will give it to their watchmaker and he will install a new crystal.

try Chans418 Main Street
Vancouver, BC Or do a search on Yelp/

make sure one or all of the hands of the watch are not hitting the crystal. It may have been pushed in when it shattered.

Any decent jewelry store can replace the crystal unless it is a very unique watch in which case they may have to order the crystal.

Thank you for contacting FIxYa.
You should be able to have any local watchmaker fix the crystal. It is a very simple procedure but if you cant find a local, here is a suggestion:

http://www.crystalfit.com/

Best regards. Jewel

The only solution here is to send it back to a Casio Authorized Service Center. I don't know if they will take care of it under warranty, unless you have some kind of Insurance policy against thief or damage. All you do is try. Good luck!

If the problem started immediately after you dropped it, then the impact is likely to have damaged it and a trip top the dealer is unavoidable.

Whatever the cause of your problem it is best left to watch repairer to sort it out.

I am not sure about prices in US, but over here in England we charge £15 - £25 for mineral glass (depending on size, thickness, e.t.c.) and £50 - £120 for sapphire glass. As for today: £1 = 1.60$. Doesn't matter how you name it - glass or crystal, both are right.