I can only repeat my recommendation to sell it NOW.
Digital oscilloscopes are not investment properties.
Let it depreciate on someone else's bench.
Be happy, that you got it when they offered the deals, so you won't lose money on it.
That is very rare on a new piece of equipment. They offered the deals since the underlying HW is the same for all models and they wanted to grab some market share.
They can do the same again at any time which will decrease the extra value your scope currently has.
If money is tight as you say, don't drive a Mercedes, especially if you aren't even driving it...