The only chain I could find that sold them locally was
Big O Tires . I bought mine from SimpleTire.com and was very happy with the price, shipping cost, and delivery time. But you need a person to mount and balance the tires if you get them online.
People that buy the Goodyear tires seem to be happy with them. But buying a tire because the company will pay the damages when/if it blows out and mashes up the side of your trailer is, to me, not necessarily a reason to pay a premium for them. Kind of like paying more for a car because the resale might be higher when you sell it. Kind of convoluted logic, IMO of course.
The newer G614 seems to be holding up very well. There were some issues with them a few years ago from what I understand, but that does seem to be behind them. I can't say anything bad about them, and I bought the Sailun because it was the difference between over $2000 for the Goodyear and about $1200 for the Sailun. $800 will buy a fair amount of gas. :)