Track parts. Where to buy

Hi all. My son has continued my hot wheels obsession and has well over 100 cars to date. I used to have loads of track parts wheb i was a kid and spent hours making and playing with them in the garden. My track is long gone and I can’t find any normal track parts anymore. They all come on some “set” and they are not great for making custon tracks. Does anyone know where i can buy bulk parts ? Based in Ireland🇮🇪 Thanks in advance