I do quite like Kasteel Rouge and Kasteel Donker 11. I used to go on beerhawk.com as they have a good selection of sour/lambic beers, but it's a bit pricey. So now if I do splash out on any good Belgian beers I go on Belgian Beer Factory. e.g. https://www.belgianbeerfactory.com/en/d-kasteel-rouge-beer-discount-10.html - 24 bottles of Kasteel Rouge for €1.71 per bottle.
Yes I'm gonna give that a try the Kasteel Rouge is lovely ! I'e tried The Leffe ruby and Delirium red beer but they aren't a patch on Kasteel. How many do you order at a time ??
I don't drink it that often so if I buy a crate of 24, it will probably last me 3 months until I buy another one, but there's nothing to stop you ordering a fair few crates at once. If I get a crate of Donker 11 it can last me 6 months. I tend to drink light pilsners as my 'session' beers and break out the belgian stuff on a weekend evening.