wallda - went over some of the credit card statements last night so I have some numbers for you on the pond.
the liners (two) about $500 each, the padding under the pond $150, around $700 at hardware store with a few more hundred still to go... have to finish the outside of the tank, a couple of months hard work?...
The big cost can come in filters, pumps, heater, water, and salt... I repaired / modified pool stuff and made my own so it's hard to say what I spent on this stuff. Somewhere in the range of a couple of thousand. No chiller as of yet but I'm not sure I'll need one... besides basic airconditioning/heating repair class can teach you all you need to know about creating/repairing your own.
The water you have two options, a lot of time with a home RO unit or buy the stuff... If your making everything like me you have time so you buy a large home RO unit, turn off the water meiter and run the unit 24/7...
Salt can be harder... you either contact a salt producing company, tell them what you are doing and they usually will help you out (better price not free) in exchange for being able to use you for advertisement or you know someone at a local aquarium, or if all else fails become friendly with a lfs and hope they will give you one hell of a deal for bring in a lot of salt.
That's it... if your interested in specs on the filters and stuff I can email drawings/specs to whom every would be interested. Just drop me you email.