To scan or not to scan

Hmmmmmmmmm to scan or not to scan, that is the question

Right so this is the dilemma.
This is definitely my last pregnancy, there will be no more after this one.
It being the last time will ever feel a life growing inside me ,I have been looking into 4D scans. These scans are performed at 26-32 weeks generally and produce the most astonishing pictures.
They are a world apart from the black and white indecipherable ones you get routinely at the hospital.
They are an amazing insight into the womb and are a keep sake that will last forever.
The black and white ones which you pay £4.00 a go for fade over time where as these are printed in wax and will never fade.
You get a 30 minute scan on dvd and several pictures of your baby in various postitons , they will even accuratelyy ( because of the quality of the pictures) tell you the sex of the baby if you want .
No were getting to the problem, the package price for all of this is £190.00.
Hmm it is a lot of money - I know - I know a new pram , a new cot etc
I mentioned it to my partner who quickly dismissed it saying "No i'ts too much money" and briskly went about searching to buy cricket tickets on eBay !!!!!!!!!!!!!!!!!!!hmmmmm
Well I know it's a lot of money but it's something that is really beginningng to draw me in and and make me yearn it.
This is it , in a few years time I won't have the black and white pics which I have now because they will have faded, 4d scanning wasn't around when I had my other 2 children.
I see it as a fantastic oportunity or is it just a waste of money .
What would you do?