I've found david lace & falcon foto to be pretty cool about it.
Most content providers will work with you if you call and ask their permission... also, sinc e most providers allow you to use a certain percentage (usually 10% i think) of the content you buy for banners & promo material.. I've found that we are usually allowed to use those exact same images for free affiliate content.
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Conversion Cash:
$35 PLUS 50% AND $1.10/Minute