Pond on the cheap

You can't skimp on a liner or a pump, but you can build your pond without rocks. Use landscape timbers. Build them up like Lincoln Logs in any shape you wish. You have to use about 16 penny nails, so be prepared to whack at them with at least a heavy roofing hammer. When you have it as high as you wish, line the inside with roofing felt and drop the liner in. Fill up the pond and then use a 1 x 4 to finish the top. If you wish, you can have a waterfall in a corner, but a bubbler in the middle is just as nice.