Is there any Mikras Gedolos in English? I am interested in learning Meforshim on Chumash, and I wanted to know if there were any online or in a store.
If you're interested in buying meforshim individually (in which case they will come with many more editorial and elucidation notes), here's a few:
I didn't shop around for which websites would be the cheapest, so I'm sure you could find better deals.
JPS is publishing an English edition. I asked about its contents here; it's a condensed version, but at one volume per book of torah it covers a lot more ground than a one-volume chumash. I'm very happy with the volume I've used and plan to add the rest to my library. Sh'mot, Vayikra, and B'midbar have been released; D'varim is due in April 2015, and I guess B'reishit will follow that.
Judaica Press publishes a set of Mikraos Gedolos with a digest of the commentaries in English.