Options for getting ~150 Windows 7 Pro licences

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In a domain environment.

What are the typical options for getting a large number like this?

Haven't had to deal with it before, everywhere I've worked in the past has already had a corp account etc

 

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Upgrading around 70 xp machines, (all of which have 7 pro oem licence stickers on them)

And buying around 70 new machines (70 of our machines are too old for 7)

So 140 machines total.

.

How do keys work in this situation? If we already have 70 Windows 7 oem licences, can these all work on the same ghost image?

If we moved to volume licencing, can these 70 be 'traded in' towards the total number?


Before this job, I only dealt with individual servers on different sites, so just bought individual server licences as they were needed.

Thanks for any info