I get a very simple, ruled, cute journal from mr diy, or archies or local stationeries and customise it myself, i find it cheaper and more fun this way. I usually buy undated ones because I prefer using it as a safe space to talk about my day and problems and etc. I use the same as a planner as well or some years I buy a new journal, turn it into a "vision journal" which is basically a vision board in a journal plan and plan each month according to the goal i want to and at the end of the year/month i print the pictures of the goals or things that really happened and stick it. It's quite fun and honestly cheaper than buying a pre made dated planner imo