You don't know how to use a calculator? It takes me less than 60 seconds to figure out what my total is going to be from looking at a BIN ad on gunbroker.
-Mike
With GOG and similar companies, I just find an FFL that's already on file with them and compare prices as to who's the best. Then I have what I want within a few days with no hassle. The few times I've used GB, it's somebody different, so I have to run around and get the info from them, and then to my dealer (they don't use email, so it's stop in when the transfer person is on duty, and when I can fit it into my schedule). Plus, GOG/similar usually has a better, up front, price. With GOG/similar, the price I pay is right there when comparison shopping. No wasting time to search each auction for small print as to terms. Lastly, with GOG/similar you can find the exact model you want. If for example I'm searching for a Savage model with Accu-stock in .308 on GB, you have to do several searches. Not all of them come up under accu-stock, not all of them are found under .308, etc. If the poster makes one mistake (incorrect caliber, or term I want to search for), it leaves their item out of a search.