I haven't heard too many good things about Gainesville Coins before, but I really wanted a Trident bar, so I went ahead and purchased a 10 ozt bar. The website is easy to use and everything seems clear to understand. The main issues are the price, shipping time, and the lack of payment options. You can only pay with a CC, wire or bitcoin. No paypal. The prices a bit high, especially when you include shipping costs which are kind of high. It also takes a week or longer to ship, even if you pay by credit card.
I would still recommend them for their Trident bars, or anything else, just expect to pay more and have it take a little while to get to you.