A lower budget should not erase what makes the person specific. It should change the scale, category and version of the idea while keeping the same recipient clues.
Budget is not an afterthought
Put it in the prompt from the start. Otherwise the model can spend half the answer on ideas you will reject. “Around €40” is much more useful than “not too expensive.”
Same clue. Different scale.

If you are a billionaire, sure.
A Porsche GT3 could be completely reasonable. For the rest of us, the useful question is not “what is impressive?” It is “what makes sense for this person and for me?”

same obsession, very different budget
If someone loves Porsches, both ideas use the same clue. Which one makes sense depends on the budget and relationship.
Tell AI what must stay constant
If you lower the budget, explicitly tell the model to keep using the same person details. Otherwise it may quietly replace “specific” with “generic cheap gifts.”
When is a gift too expensive?
There is no universal number. It becomes a bad fit when it strains your finances, feels wildly out of scale for the relationship, creates pressure for them to match it, or you are spending more because you have no better idea.
Budget can improve creativity
A real limit forces the recommendation toward smaller experiences, consumables, repairs, useful upgrades or specific versions of an idea. That can be more thoughtful than a high-priced default.
Ask for budget tiers when you genuinely have flexibility
If you are deciding between roughly €30, €60 and €100, ask the model to keep the recipient clues fixed and show how the direction changes at each level. This is more useful than asking for a single giant list sorted by price.
Do not anchor on the expensive idea first
If the first suggestion is €150, everything cheaper can start to feel like a downgrade. That is a shopping bias, not evidence that the first gift was better. Start with the real ceiling you are comfortable spending.
Copy the budget prompt
My gift budget is [amount]. Treat it as a real ceiling. Keep using these person details: [relationship, interests, useful clues]. Avoid [categories]. Give me five genuinely different directions inside the budget and explain why each still fits the person.
For broader birthday-budget etiquette, read Giftin's general budget guide ↗.