I agree with nymack66 on specifics... You have to know what you're shopping for and we can't give you really accurate advise unless we know also. But if you know what you are looking for then I'd suggest eBay as a great source. I've gotten some really good buys on gauges for boats I was restoring. Just shop around, make sure what you see is really what you need and then observe the bidding for a few days. That will give you an indication if you're going to get something at a great price or just a good price.