AC to DC Power?

I have a new panasonic DVD player model PV40 that I want to hook up in my car to a LCD monitor and I want to power it up.  It only came with an electrical cord for home use and I want to convert to a 9V for the car.  The 9V converter from panasonic is $130 and radioshack has one for around $20. 

The current AC to the unit indicates 1500 mA output.  The player does have a 500mA output in order to connect one of the high tech eye glasses that you wear and it simulates a 48" screen so you can watch movies in airplanes etc.  I will not be using the output so it would seem to me that the unit is actually drawing 1000mA.  Is this correct?  The question is...the converter at radio shack only puts out 900mA.  Will that be enough power to run the unit or will it damage the unit.  Please help.  Panasonic will not make any recommendations for alternatives to there products.  They will lose revenue from the outlandish prices that they charge for the assessory converter. 

Any input would be greatly appreciated!

In regards to the inverter relay:

https://www.the12volt.com/installbay/display_topic_threads.asp?ForumID=5&TopicID=2369&PagePosition=1#reply

Hi Radace, since you say your DVD player draws about 1500 mA (1.5A), you should be able to use any power inverter that is capable of providing at lest 180 watts of power. [Power (W) = Volts (V) * Current (A) ] It is not safe to assume that since you will not be using the "high tech glasses" that the current draw will be reduced by 500 mA because you cannot dirrectly determine how the DVD player's internal circuitry uses the power it recieves. It may be so that the system reserves the extra enery through the use of circuits that "tell" the player if the external glasses are connected or not. This may be possible since your DVD player is also a battery powered device. But I can't tell you that for sure. If you have a multimeter that can measure AC current draw, you can determine whether your assumption is correct, however since your talking about 120 VAC, it is very dangerous to do this if you do not know how. It's been my experence that it's better to assume the worse case senario when it comes to the power inverters that way you should always have the power you need. Crutchfield has three inverters that it sells ( http://www.crutchfield.com/S-37i4Q59WqK4/cgi-bin/prodsearch.asp?s=0&g=850&est=&search=inverter) , however I am sure the one from RadioShack is fine as long as it can provide a power minumim of 180 watts. I hope this helps, and happy viewing!