Originally Posted by gretchendz

A good travel advisor could help you locate what you want. Virgin has recently been running some good discounts on solo cabins, depening on sailing and cabin type, of course.
There's no harm in asking as most do not charge you fees for something like this.

For Alaska if you want Glacier Bay, consider Princess, Cunard, HAL. If you don't care about GB look at Virgin who begins sailing there in 2026.