I don't know for sure, but an England(current) player with sponsorship would be vastly different in numbers than and an Ex England player simply due to the coverage so it won't be the kind of deals offered to KP and Freddie back in 2005.
No one knows for sure if Bell is actually ex-England but it looks likely right at this moment he won't get back in to the side anytime soon.
The real big fees are saved for the likes of Root/stokes, prob Cook etc......
The average County Pro I don't believe earns anything like some might believe from sponsorship......