Well I am NOT suggesting you get into debt for boots or anything else but you could pay with Klarna (over 3/4 payments) for some more expensive boots?
Your mum would maybe make the first payment of £30 or so and then you pay the rest off each month? But don’t do it if you can’t afford it.
Also worth looking on eBay for unwanted boots that were presents and Depop too. I’m not fussy about second hand shoes though.
My DMs were fine to break in. 