If you are a first time first Cart sale shopper, the events are hosted twice a year by The Wash (with the occasional extra themed event thrown in for good measure). It brings together a diverse collection of designers and builders and for the duration of the sale, everything is only 10L or under. The streets of the Wash sim are taken over by carts filled with goodies and there is always a lot to see and do. In addition to the Cart Sale, the sim hosts some terrific stores, a carnival, and also the FabFree headquarters.
One thing to keep note of is that the sim does get busy, especially during peak times. Do your part to cut down on lag by leaving your script-heavy items at home when you come to visit.
The Wash SLurl: HERE