Back in October I was able to get $300 on the WindTab+ for a Nexus S. I work part-time and had about 1 year of credit history when I got the tab. My credit score was slightly higher than 600 if I recall correctly.
I also know a guy who was able to get $500 on the Tab for the Galaxy Nexus last month. He's working full-time for Bell right now and had a really short credit history.
LG Rumour (Virgin Mobile 2008-2009)
Motorola KRZR (Koodo 2009-2010)
Motorola RAZR (Telus 2010-2010)
Samsung Galaxy S Vibrant (Wind Oct.2010-Jan.2011)
Samsung Gravity II (Wind Jan.2011-Oct.2011)
Samsung Gravity II (Rogers Summer 2011)
Google Nexus S (Wind Oct.2011-Mar.2012)
Google Nexus S (Koodo Mar.2012-Present)
I change often...