Are you looking for a Xilinx Spartan 6 board? If you are, you certainly know your hardware and parts. You’re probably either dreaming a system that involves it, or you already have one and are looking to upgrade an existing part so you can better performance out of your rig. In either case, you need to order one before you can possibly get your hands on it and install it.
Knowing where to find such a part can be a little tricky though. Granted, you might have an electronics store in your community that carries something as specific as this, but is it worth it? Yes, you can run out and get it and come home with it in just hours or less, but you’re also going to pay full retail, and then some.
The real shopping center for such electronic parts is often the Internet. E-commerce sites from giant retailers to small-scale distributors carry selections of things like the Xilinx Spartan 6 board and many other parts and pieces. All are often cheaper than you would find in a big box retailer and with quite a huge selection. You can even probably find multiple websites all selling the same model and then price shop between them.
Just remember to factor in shipping. Of course anyone doing free shipping is worth a look, but keep in mind how fast you might need it. If you want overnight or something guaranteed by a certain deadline, then you might have to pay up extra for shipping.
Another possibility, if you are open to it, is auction sites. Secondhand technology or used consumer goods are sometimes still good as new, or just good enough, but available for prices a fraction of retail. Of course, you have to be okay with doing that.