Moving selected apps from PC to iphone

I have enough apps to fill up my iphone many times over so regular syncing isn't an option for me. I would like to move only a handful of apps from iTunes on my PC to my iPhone. I know I could just go to the app store and download apps individually (something I normally do now) but the problem is that many of the apps I have such as learning games in foreign languages are no longer being sold on the app store so that my iTunes library is the only place I can get them from! : (
Is there any way to send only a few apps from iTunes on my PC to my phone without iTunes trying to send the whole library over?
Is there perhaps a user-friendly 3rd party program that does this?

via iLounge Forums http://ift.tt/1Imzvhe