Depends on the company but most do and generally they offer some form of a discount. They don't always have inventory on hand, but you might be able to make a purchase there at a discount and get it shipped to your home. It just depends company to company.
Oh wow interesting. Finally a chance to try/compare instead of impulse buying.
Here is another tip. Ask for a discount. Most vendors have show discounts that they don't offer outside of trade shows. Some very smart vendors will extend discounts to other products in their current line as unadvertised specials.Pretty much what @Dellwolf said. Some do. Many don't. Because many exhibitors ship their materials to the show - which includes much in the way of displays and associated gear - it can often be prohibitively expensive to also ship product inventory that may or may not sell out, and thus have to incur even more charges when it's shipped back to them after the show.
That said, here's a tip to potentially get a great discount: buy a demo!
If you're not OCD about getting a sealed/NIB/retail package, then you could always ask an exhibitor if they'd be willing to sell you the floor demo that they brought to the show. While it's not new, you can bet your last dollar that the demo would have been well cared for, since their reputation depended on it working flawlessly at the show. Demo discounts can often be significant, though the exact discount varies of course.
There's only one catch: obviously you'd have to pick it up at the end of the show (since they need it for their exhibit). But yeah, it's a win-win. You get the gear that you wanted for a great discount, and they don't have to waste expense packing it and shipping it back.
