A lot of the pieces on Restoration Hardware can be achieved by just keeping your eye open for deals at local decor stores, vintage shops, second-hand stores, or even the side of the road. Palette tables with large industrial metal wheels, oversized sofas with tufted backs, buttons, and castor feet, metal lighting solutions and antiqued pieces for an antique cost.
Pottery barn has a lot of similar pieces but are less expensive. There are tons of boutiques in small towns that have wonderful pieces that are not as expensive as well. Even greating your own pieces will save you a lot of money. Mentioned earlier, palettes are a big deal right now and by sanding them down smooth and staining/painting/or using a clear coat on them will give them a durable finish that can be used on a daily basis as a table (just add wheels), a cool bookshelf or even a unique headboard/bed frame that is on the ground.
Sand painted surfaces, rub metal surfaces, oil leather to darken it....there are tons of different techniques to create that Restoration Hardware look. Just keep your eyes peeled and you will see those pieces that can be fixed up, save you money, and create that dream home you've always wanted!