Book the entire trip as soon as your husband knows when he can get off work. As of now (and it may be different tomorrow).....How far in advance would you book this trip?
• For LAX to SAS, the Roomette upcharge is $272 for 1 - 30 Mar 2019 which is $80 above the low bucket of $192.
• For AUS to LAX, the Roomette upcharge is a low bucket of $192 except for 16 Mar 2019 when it's $80 more or $272. However, this is not a daily train as it departs Aus for LAX only on Tu, Th and Sa
Once you book (to simply insure you have the sleeping accommodations you desire - in spite of price) if the price goes down, call Amtrak and have your ticket modified to the lower fare - and get a full or partial refund. If you try waiting until the Roomette upcharge decreases there's a chance it may never decrease or of it does, the Roomettes may all be sold out by the time you notice or are notified by AmSnag.