I have been waiting for an advertised 10-lb onion sale for the last few weeks too. Great price at Esposito, emg! Looks to be unadvertised so I am still on the lookout if anyone has any tips!
Fruiticana has decent prices, but I am hoping for cheaper:
50-lb onions for $10
25-lb red onions for $10
10-lb Russet potatoes for $2.88