DIY: How To Improve Your Water Pressure - this post lists several culprits for low water pressure with solutions to fix the problem. Before you call a plumber, check out this post! Some of the fixes listed are very simple to do!
These are made from copper washers from Harbor Freight. The hardware store, Home Depot, Lowes, Harbor Freight are economical sources for jewelry making supplies. (Look in both plumbing and electrical departments for copper and alumnium washers, wire, etc.)