I am not sure if you can get it in BED format _per se_ , but you could -
1) Anno file in GTF format from here - http://www.ensembl.org/info/data/ftp/index.html
I am assuming you are looking for human. If not, go in here and choose your organism - ftp://ftp.ensembl.org/pub/release-83/gtf/
2) And of course you can use BioMart -
Here too choose your organism.
Once you have used either of the above, you can shuffle the columns of the final file to make a BED i.e. chrStrtEnd
in its simplest form.