Is it worth asking to buy?

Hey guys.

As you probably know, I'm a fan of Attack on Titan. I watch the episodes on YouTube. The channel I watched it on has mysteriously shut down, so now I can't find decent episodes.

I was bored, so I looked up 'Attack on Titan' on Amazon.co.uk and I found this.

I'm presuming it's the full season being as it's 360 minutes running time. I also have a £5 amazon voucher from my school for 100% attendance (looks like staying in school for over 40 weeks has a good use), bringing it down to £24.

My Step-Mum knows I like anime (she plays Street Fighter, it's anime), so she might accept it. My Dad, however, is trying to get me to get a book (I READ THE NEWS FFS!), and that's the problem.

I'm basically asking your opinion if the price (£24, I got the voucher) is good and if I should ask.

Thanks for reading.