I always use Continental, United or Delta when shipping within the States. United and Continental seem to be the more inexpensive ones, but sometimes Delta is the only one to use for shipping to certain areas.
I also remember your 29 year old chin, but that was so many years ago you had him and posted about him back when this forum was known as cnq. I think that was in 2005 or so?
I'll have to check out your facebook page. I remember the photos of him from back then. I often have told others about him over the years, because some people have no idea just how old chinchillas can live to. Not really any secret to how he lived so long, other than good quality care and food.