HH, if you go to the buy & sell area, the RCU marketplace. you could look thru there. there are alot of planes in there that you may get for a 100 or less and some of the small ones are RTF. i know being 13 you d probably really like to get a plane and just go fly,but there is ALOT to be said in building a plane. you dont have to do a 4 yr detailed warbird build. there are many nice lil balsa planes that are Easy to build, or you can get an electric plane. something like the GWS line. they go for about 30 to 40 dollars. you ll need to do SOME work but very little in comparision to a full balsa stick plane.... plus your LHS should have kits and parts available on hand, or should be able to order it for you if they dont.

maybe someone here will have a small .15 size close to RTF they could sell ya cheap. maybe you could list what it is you currently have, and maybe we could suggest things to go with it.
HTH.
let us know what you chose, and how it works for ya.
Tim