buying MS Office

My client is asking to install Microsoft Office Professional 2010 in their office. It has to come with Access, so I guess Professional version. They have 4 desktops and a laptop in the office, and another desktop at home, so 6 PCs. I would like to make sure I get them all the proper licenses without overpaying. I'm looking at this page.
http://office.microsoft.com/en-us/buy/office-2010-which-suite-is-right-for-you-FX101825640.aspx

I guess I would have to get 4 of the $350 licenses and one $500 license, since the home desktop is used by the same person as one of the office desktops. Does it work that way? I was also looking at their volume licensing but they seemed to quote me $500 per license. I'm either doing the quote wrong or it's a bad deal for this size office.
http://www.microsoft.com/licensing/mla/

I am looking for some advice, before I commit to the purchase. Would I save a considerable amount of money by getting it elsewhere? I have bad experiences buying software on Amazon.com, so I'm a bit hesitant. The client insists on 2010, and not any older versions.
detail_seekerAsked:
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Jian An LimSolutions ArchitectCommented:
really depends on budget and requirement.
the $350 version is a Non-transfer licence. (once you install, that licence tight with the box, not with users) where the $500 version has rights to install on 2 pc at any time, but again , check with the requirement.

If you are getting $500 on volume licensing, you are getting a better deal.
Volume license allows you transfer your licence multiple time to different computers, as long as only 5 copy is installed and using (this includes home use i believe).

I will go with volume license, just for a bit flexibility.

AND if you want to pay for a Software assurance 20% of the original cost i believe.
you guarantee a new office 2012 - let's say, for free, if it happens within next 3 years when you bought it)

so it is your choice, buy the cheaper version, and keep buying when the next version come out, or buy now, with SA, and guarantee the software currency for next 3 years (and renew at that time again? i can't remember the details)

it will be best to check with microsoft team.

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detail_seekerAuthor Commented:
I ended up talking with the Microsoft retail division. They couldn't tell me what is the difference between the volume license and the retail license, but they assured me that if I buy the retail version and need to replace my PCs, that I could reinstall on new PCs with same license. I would just have to call them. I also read the EULA and it says you can transfer once every 90 days without a problem. And if your PC crashes, you can even transfer sooner.
detail_seekerAuthor Commented:
I think user limjianan may have been referring to the OEM or pre-installed version of the Office, which indeed is non-transferable and it's stuck with the original hardware. I was shopping for my software separately from PC purchase, so it's a transferable retail license.
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