Adorama offers the Lowepro Scout SH 100 Mirrorless Camera Shoulder Bag in Slate Blue, model no. LP36930, for $19.95 with free shipping. That's the lowest total price we could find by $30. It features adjustable dividers, detachable shoulder strap, and front flap pocket.
Also available is the Lowepro Scout SH 120 Mirrorless Camera Shoulder Bag, model no. LP36931, for $24.95 with free shipping. That's $35 off list and the lowest total price we could find. It has the same features as above plus room for another lens.