There is a usb serial flash programmers here not sure if this is what you are looking for:
http://siliconkit.dnsalias.com/cart/spi.html

Also I have seen the xeltek programmers mentioned. I use the superpro 3000U.
But it is a little more expensive. See here: http://siliconkit.dnsalias.com/cart/3000u.html