Vallejo has a replacement for bronze flesh if you really need it. As a matter of fact they have a complete set of paints which are replacement colors for the entire GW line. In my opinion they work better than GW (I know, I speak heresy!). The Vallejo paints lay down nicer, have better pigmentation (I tested it in my color lab) and have better flow than GW. The down side is, you have to shake the living hell out of them before you use them. Shake until the funny smell is mostly gone from the paint.
Here is a link if you want to order them-
Vallejo Game Colors If you get the set, it comes with a nifty (yes I used "nifty" in a sentence) carrying case which include a few so-so paint brushes. I believe the case comes with a total of 72 paints (including gloss, matte, and satin varnish bottles). The entire set comes with 95 bottles. The GW replacement colors are called the "Game Color" line. Vallejo also has a "Model Color" line and a line of air brush paints.
I hope this helps out.