I may not be remembering correctly, but way back when I first started shopping for them (around 4 years ago), didn't they used to send out e-mails once in awhile saying that there were jobs for which you were eligible on their site and you could log in and see a list of available jobs? To be sure, it was short, but I remember logging in to their site far more often than just to check on jobs I'd already done. Maybe I'm thinking of another company, but I could swear it was ISC. That being said, the only way you could get a shop was to respond to their e-mails.
I learn something new every day, but not everyday!
I've learned to never trust spell-check or my phone's auto-fill feature.