Is there any publicly available multi-omics dataset? I am searching for a multi-omics dataset which may include genomics, transcriptomics and proteomics (eg. snyderome).
I need such a dataset for an introductory data-exploration purpose. So it can be from any host organism and any experimental methods/conditions.

Is there any database/repository where I can find it?
There is a database called OmicsDI, where one can search for multi-omics datasets.

Here's a link of the associated publication (Perez-Riverol, Yasset, et al. "Omics Discovery Index-Discovering and Linking Public Omics Datasets." bioRxiv (2016): 049205.) for more details.