Lumix GH3 Economic Lens?!

Hello,

I posted before asking about the GH2 settings and whether it is more functional for me to get the GH3 due to my discomfort with the shutter noise and the quality of stills from the camera out of the box.

I made up my mind and returned the GH2 and placed an order on the GH3 body only--will receive in less than a week from local store branch in neighbor city.

Until I can afford collecting professional lenses as I need and depending on my experiments, I am looking for a starter lens that works with the GH3, producing decent quality images and videos (mainly for indoors interviews for my school projects) that is between $200-300 ---or less :)... Any recommendations? Is there such a thing? Would I loose AF or other features? 

Best,

S