Windows 7 computers were in short supply last year & are back by popular demand. Some OEM's, such as Acer, needs all the help they can get to sell computers & HP launched a notice of 7's return. Dell offers the same XPS 8700 that I have (specs in my sig) with Windows 7 HP & Pro, however I bought mine at Costco for $699 with Windows 8. They had the XPS 8700 with Windows 7 Pro with 8GB RAM, instead of 12GB for $799, but sold out before I could grab one. Still, for the hardware I got, I came out great. That i7-4770 is a top ranked chip at PassMark & sells for around $300. Plus 12GB 1600MHz RAM isn't cheap these days either, when memory falls back to late 2011 pricing, I'll stuff it full with the 32GB it'll hold.
However, I had an extra version of Windows 7 Home Premium (OEM) that I grabbed on promo for $69 at Newegg, so I went through the procedure of disabling Secure Boot, changing to Legacy Boot (MBR) & there was another setting to ACHI. Then I removed the OEM HDD from the PC & installed a fast Samsung 840 EVO (WEI 7.9), loaded & activated 7 HP, installed drivers, updated, then using the Windows Anytime Upgrade key from a dead PC that I purchased in 2010, upgraded it to 7 Pro. It took a phone call to activate. If one has such a key, it's transferable to another computer, so long as it's not being used on another, but has to be upgraded from the same version of Windows 7 as the original.
Keep in mind, that one can still obtain the OEM versions of Windows 7 from Newegg & other retailers. It's best to avoid online auctions, such as eBay, for this type of software. Though I was refunded by eBay, I once got burned with a counterfeit copy of XP Pro from a seller on their site.
Costco normally offers one or more Windows 7 HP or Pro computers at great pricing. And note that this "deadline" is for Windows 7 Home Premium. Windows 7 computers can still be obtained for business (the Pro version) & Costco caters to businesses, depending on membership level, so they may be obtainable there for awhile still.
There are also many promos online, just search "Windows 7 computer promos". Some links may be outdated (expired), while others may be good. If one is found, be prepared to buy, as these moves fast. Most of these codes links back to the OEM, or a major retailer such as Newegg, Staples, Best Buy & others. Make certain that the description of the computer meets that in the promo ad. I have caught Best Buy cheating, a i7 was promted, yet when I got to the site, it had an i5. An XPS 8700 with 8GB RAM, NVIDIA 640 (DDR3) GPU & i5 is overpriced at $729. I got 4GB more RAM, a 1GB GDDR5 GPU & an i7 for $30 less.
The customer has the advantage & this is clearly a buyer's market for Windows computers of all types. It's highly possible that an OEM or local major electronics retailer will bend & install Windows 7 if 8 isn't desired. Spend an hour or so time with the salesperson, begin talking down price (yes, they will!) & at the close, agree for the deal if 7 is installed. I personally know of 2 people who done this at Best Buy & both also received install media. That shows the markup on these units.