Expertvoice and GovX are different entities. It's the same discount at 40% off MSRP though, which will always bring you in under the normal retail price. That said, we are legally not allowed to mandate what prices a dealer sells our products at, so you may be able to find it less somewhere else - that's entirely up to that dealer and how much they're willing to sell something for.
As for the availability of products on those sites, keep in mind that they have a direct link to our stock here. You are buying from us directly when you go through them. We service dealers across the nation, across the world, other Mil/LE customers, local customers, etc directly from this location. That means, to pull some numbers out of thin air, where we might have 1,000 Razors of some sort on backorder, a single retailer might have just 2. If they're placing orders through us on a consistent basis and, thus, getting products in on a consistent basis from us as we fulfill their orders that come up over time, then they might have a product in stock at their store when we don't have it available here.
Some of our retailers know this and offer their own Mil/LE discounts that match ours. AAOptics comes to mind - you can always go check them out, too.