I haven't been on FOTS but the other RCI ships I have been on have offered a DVD of the week. Its a combination of standard ship and port coverage plus somewhere in the region of 15 minutes specific to that cruise.
Although can't be sure - I think it was around $25-$30.
We bought one on our first RCI cruise - and to be honest were pretty disapointed. The 'behind the scenes' extras just covered how the DVD was put together, where we had expected an insight into the running of the ship. For the price we expected more...
I'm sure however many others were happy with this as a souvenier so don't just take out word for it. Although I'm sure you weren't going to anyway!