is 1.5 amps the stall? if it is that is a good thing because thats not too much current.
okay I looked around and found these. Pololu - DRV8835 Dual Motor Driver Carrier
they can go up to 1.5 amp stall and control 2 DC motors. not bad for $6.
I would measure the current at different voltages and see if you can run your motors at say 4 or 5 volts. that will lower the current use for the motors and would give you more of a safety margin.
EDIT: just read this about the controller.
if you are willing to pay double, you can use one controller per motor and tie both channels together.
Motor outputs can be paralleled to deliver 2.4 A continuous (3 A peak) to a single motor