Double buggy dilemma!!

Hollie • Married, young, SAH Mummy to a beautiful nearly two year old girl and expecting a little man the end of November!
Hello ladies!
I am due in early December with my second baby. My first daughter turns two the end of November so I am wondering what you all think about getting a double buggy (stroller) as a pose to a buggy board or just sticking with the one and letting my daughter walk?!
She walks very well but I don't think she'd be able to handle long distances and as I won't be able to drive after the birth for six weeks I will be walking everywhere (we live atleast half an hour from our local town with shops). 
Is a two year old too old to be in a buggy?! I have no idea! 
I will add we don't have a huge budget so cannot afford the £1000 double strollers so would need something that works well for us and doesn't break the bank!
Sorry this is so long and thanks for the Help! 
These are my babies 😍