Lamps at Home Goods, Marshall's and TJ Maxx often have two of the same styles if you are looking for a pair of lamps. But, they tend to be on the large side, so pay attention to the scale of your night stand or furniture you plan to place the lamps upon. The Christmas Tree Shop has a lot of lamps as well.
If you are on a tight budget, you can find all sorts of lamps at thrift stores such as the Good Will and the Salvation Army and Second Hand shops. All you really need is a keen eye on the shape you like because you can transform any lamp with spray paint. Spray paint comes in so many colors and metallic finishes, so you are sure to be able to match your décor. But the thing about getting a bargain lamp is you will need a new shade and they can be expensive. So, keep that in mind for your overall budget.
You can also shop for lamps on-line at OVERSTOCK.COM, WAYFAIR.COM, LAMPSPLUS.COM, DIRECTLIGHTING.COM or by doing a simple google search. But, remember, you need to pay close attention to the measurements. Take a tape measure and imagine the lamp in the spot you intend to put it by looking at the height and width of the lamp to be sure it is the size you need. Some lamps look great in a photo, but when you get them they are dinky or way too big.
Another consideration when buying a lamp is what type of bulb you can put in it. If it is a 40 watt lamp, can you really read with that low light? Would 100 watts be too bright? Do you intend to use CLF lights that cannot be used with a clip shade? Or go with LED's? Keep light bulbs and their wattage in mind when you buy a lamp.