scRNA-seq benchmark data

Question

[fifty_fifty]

I need benchmark datasets to test clustering methods for scRNA-seq data. Does anyone know a scRNA-seq dataset with ~3000-5000 cells with pre-defined cell types?

I found the 'scRNAseq' R package with predominantly pancreas scRNA-seq datasets. However, the datasets there are labeled with cell type labels after clustering with Seurat. Are there any datasets or packages with datasets with pre-sorted and pre-labeled cell types?