IMO if you have so little budget dont at all go for wireless stuff u'll really regret it in the future... wireless combo are not at all good, u'll have to keep changing the batteries every now n then... if you really wanna go with it get Microsoft wireless optical desktop 1000 which will be within your budget... i have got one of these and it works pretty well...
and for a 8GB Pen drive go for corsair voyager GT 8GB its got 10 yrs of warranty and the speed is also good...
if u are into gaming... wireless keyboards in ur budget is a big no no... they often lag in fast paced games (FPS)....
I am not into gaming...!!