My two siblings and I do joint presents for my parents. Our budget is £50 and we stick within a little way of this either side depending on the exact item chosen. This is the way we've always done things. The reality of this is that the load of choosing, shopping, wrapping falls on me and they just reimburse me the money afterwards - it's just the dynamic. A small part of me resents that this allows them to get away with being useless and getting the credit while I put in all the effort. But in the grand scheme of things it's not a big deal and I can't be bothered to change it. It's worth it to me to ensure that my parents get a thoughtful item they will enjoy (which I think is unlikely if siblings left to own devices). This is perhaps irrelevant backstory!
Anyway, currently looking at mum's bday present. I've left it a little late and we need to order over next couple of days. The item I know she wants (because she remarked on it when we were shopping earlier this year) is £149, so exactly at budget. I always look for a discount obviously but have not been able to find somewhere, despite my efforts. The one place I have found which does do a 20% discount requires a minimum spend, which we would not meet.
I have separately been considering another item for myself which is £130. I've been dithering for a couple of months because it is a pricey item. If I bought this item at the same time, a 20% discount would apply to the entire basket (£55 discount, only £26 of which is attributable to my item). We'd also get free shipping. A £26 discount still makes the item borderline for me. A £55 discount makes it a definite yes.
Would AIBU to use the entire discount for my item and ask my siblings to transfer £49.66 for the present? Or is that a form of theft?