is there something like this?

[superbassman2000]

hello, i don't know if this has been made (obviously yes, but on a larger scale) i need a box that has two 1/4 inch inputs with separate volume controls that leads to a single 1/4 inch output (for headphones or amp input) i know there are mixers, but is there just like a two channel mixer out there? Otherwise would it be hard to make? Please help!
Charlie

 

[tuBass]

rolls makes several things that fit your decription. Musician's Friend carried many of those products.

 

[Passinwind]

Radio Design Labs makes little mixer modules, and lots of other handy stuff. Fullcompass.com sells RDL products. Not sure this'd be any cheaper than a $50 Behringer mixer though.