With not much budget, many of the recomendations like e.g. the T480s seem too expensive. I'd recommend a secondhand ThinkPad from the T series and suggest to a

With not much budget, many of the recomendations like e.g. the T480s seem too expensive. I'd recommend a secondhand ThinkPad from the T series and suggest to ask on the reddit thinkpad forum with more details (budget, size).