Cost to upgrade to unlimited Wifi onboard (for 1 person)?

[KKB]

I have an "upgrade offer" in my reservation for $90 for 2 devices, a significant discount from their one device upgrade.

Will I see any cheaper price once onboard?

I have $100 OBC & would love to do it, but if it is the $175 price there is no point in waiting.

Thanks

[hallux]

If you don't use any of your free minutes (don't even activate them, when you do that is when you get the upgrade offer) you can trade them in any time before day 3 and get a credit toward the paid package for one device.  The credit on board may be the same as you're seeing now but if you can wait the couple extra hours until day 2 you can avoid paying for the internet for that extra day where you'd get less than half a day of use at the same price as a full day.  I think you'd end up saving around $10 on the unlimited (non-streaming) but only getting one device online at a time.