Ratshack seems to have two portable headphone amps in their online catalogue now. There's one with a built-in 3-band equalizer:
http://www.radioshack.com/product.as...5Fid=33%2D1097
and one without:
http://www.radioshack.com/product.as...5Fid=33%2D1096
They also sell an RCA desktop model for "low-impedance" headphones:
http://www.radioshack.com/product.as...5Fid=31%2D5000
Not exactly "cutting edge", and maybe borderline crappola, but hey...
http://www.radioshack.com/product.as...5Fid=33%2D1097
and one without:
http://www.radioshack.com/product.as...5Fid=33%2D1096
They also sell an RCA desktop model for "low-impedance" headphones:
http://www.radioshack.com/product.as...5Fid=31%2D5000
Not exactly "cutting edge", and maybe borderline crappola, but hey...