where would i purchase a video card for a HP slimline pc?

I have a HP Slimline s3123w pc and when i try to boot the pc it gives me a beep code of 2 short and 1 long. I looked up the beep code and it says "unable to initialize video" I was going to order a video card for it, but normal sized ones won't fit in the slimline. the bracket is too long. Which one and where would be the best place to get one for this pc?

P/N  GC659AA
HP Pavilion s3123w
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Have you tried HP themselves?  They would probably be the best to buy from.
ebay is always an option..

see this link to a forum and see if this helps...talks about
radeon hd 5450 pci-express video card

and finnally

this one should fit...i read about it from another forum.   a user says it runs without any other upgrades being necessary.

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BriPCAuthor Commented:
would something like this work you think? I am looking for a much less expensive option...
Anthony RussoCommented:
That card listed would fit perfectly and if you have an HDMI input on your monitor, will be able to use the included HDMI cable.

Good luck,

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