Cheap dent puller for small dings/dents

You probably can't. A-pillars are made tough and if it is much of a dent at all you are looking at getting spot welding a stud to pull it with a slide hammer. If it is a light dent and does not have a sharp crease there is a slight chance a hot glue tab might get it. That would be your only hope without painting. you do not want to drill an access hole from the backside as this will jeopardize the structural integrity.

if the big is not real small, and covers a flat part of the door (with no moolded body lines), you can buy a suction body puller and it should work. also, try dry ice and sometimes, (if you hold your mouth right, lol) it will shrink the metal and the dent will pop out. be sure to wear gloves!! finially, you can buy a small spot welder,puller system. just weld the "tabs" on in strategic places, use the attached puller, and slide hammer the dents out. it takes practice, but it can be done.

Joko,
You are not very clear on exactly where the dent is. The area behind the side door is called a "quarter panel". These parts are not easily replaced, as they are a welded, structural member of the car's structure. Replacement requires specialized cutting and welding tools, normally only found in auto body shops. If the dent is not to bad, you could try removing the interior plastic trim panels and pushing outward to remove the dent.
Providing that the paint is not damaged and there is not an actual crease in the quarter panel [commonly referred to as a "pop" dent] I would suggest contacting a DENT WIZARD company. They will come to your house and fix the dent, using specialized tools and skills. Do a Google search for PAINTLESS DENT REPAIR including your geographic location in the search to find local companies who can do this work. It's much cheaper than taking the vehicle to an auto body shop.

the best way is to use an impact screwdriver with a #3 phillips bit but if it already stripped out i use a sharp punch and a hammer. make a small dent on the side of the screw and lightly tap the dent that you just made in a counter clockwise dirrection to remove.

unfortunately, the quarter panel is part of the unibody. if the dent is not too severe, have it repaired at a body shop. if it is larger damage, a body shop can cut and weld a patch. best thing to do is drop by a body shop and have it looked at it.