For Exclusives at IS thinking about alternatives I have some help for them which is found here below.

It is a submission portal called Isyndica (url supplied below)

http://vds.isyndica.com/Affiliate/sumos


This site in itself isnt an alternative to Istock, what it does is it offers one place to upload your work to and from there you can submit it to multiple sites, so you upload once to one place which then distributes it to the sites you want to submit to.

It also offers overview of how the best sites are performing and also how each site you submit to is performing for you. On top of that it functions as a backup of the work you upload there and you have overview of what images you have uploaded and to which sites these images have been sent to.

Before you submit to any sites you obviously need to register with those sites but you have in one place at Isyndica information about many many different stock sites and others as well. For me this has been one of the best investments I have made regarding microstock

the subscriptionplan runs from 49.99 79.99 and 149.99