How to buy individual park tickets from UK?

I'll be visiting Orlando from the UK in July 2026. On the UK website there is only the option to purchase the 7 or 14 day park hopper ticket. However, me and my family don't want to visit all the disney parks. Is there any way that we can purchase individual park tickets either from the UK or once we land in Florida? I have heard you can queue up for tickets at the park on the day but was hoping to avoid this, do the supermarkets sell individual tickets or anywhere else? Thank you!