If you're looking for decorative lamps, try your local home decor store such as Home Goods or Marshall's. Many times they have lamps that have a nautical "theme" and most are half the price of one's found in specialty shops or online. Last year, I bought a lamp with a large nautilus shell for less than $50 (including the shade) at Steinmart. You just have to have patience and look for what you want.
Lady C