Drag sprites and after, sprites will lock in to closest position

This is a bit hard to explain so I drew a little picture to help.

The picture Isn't very good, but basically if clicked on the top picture, then you dragged your mouse left, it would drag all the squares left with it, but all the squares are different sprites. Then when you let go, all the squares would lock into the closest grid position. Also I just want sprites to move on the x axis, so if you click and start dragging mouse down, it wouldn't do anything.

I am willing to pay a little for help with this, or if you have useful links or tips that would be much appreciated.

Skype: lq129129129