I think there needs to be alerts for when you can buy from the crystal shop again, and possibly the token shop as well.

I don't think that's really necessary, especially with forum groups such as TSrestock. They will ping you when there is a new restock :) I'm sure there is one for the crystal shop too.

It's mainly for the crystal shop since you can buy every half hour, so you get an alert when the half hour's over and you can buy again, not when it restocks.

Oh, duh. I misread your suggestion. Sorry about that :P