Where can I find a website or what store would sale a stop valve for a 3/4 ID hose? I am attatching it to a blige pump that is going to pump water out of my livewell

Home Depot or a plumbing supply house . If you are talking about a check valve . Make sure you follow the arrows on the valve for flow and be aware there are check valves for horizontal and vertical applications.

Hope this was some help to you good luck

Here's one at HD, not the correct size but you still might be able to work with it

http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100021846

From the Look of this one your should be able to change the hoses on the inlet and outlet sides.

Me thinks I need to pick up some of these for my project that I'll be starting soon

found one!!! Thanks