I want to buy sleeper accommodations on the Empire Builder for the 4th of July weekend for my family of 6. I've been pricing tickets for the past couple days and by mid-morning the superliner bedroom and family bedroom options have sold out for the newest added day. We'll take 3 roommettes if we need to but I'd like to know what time the next day becomes available without waking up hourly for trial and error. I've spent an hour searching the forums without finding a definitive answer. Can anyone help? I also found amsnag to have broken links - can anyone give me the most recent link for that?