[masraum]

I bet this one wouldn't have been so easy (but I could be wrong).

http://www.amsecusa.com/Burglary_and_Fire_Protection/BF_Series_Gun_Safes/

If that isn't good enough...

Check into the TL 30 on this page. One that's 4" shy of 7'x4'x3' may run you about $8,424.15 (shipping is $2k) according to a quick search of the net.
http://www.amsecusa.com/Burglary_and_Fire_Protection/AmVault_TL-15_and_TL-30/

Here are some sizes and shipping weights for you.

Model --- Product ---------------------- Dimensions ------------------Weight
CF1814 - 21.5” D AmVault TL-30 -- 25” H x 21” W x 21.5” D -- 710
CF2518 - 25.5” D AmVault TL-30 -- 32” H x 25” W x 25.5” D -- 1125
CF3524 - 42” H --AmVault TL-30 -- 42” H x 31” W x 29.5” D -- 1764
CF4524 - 52” H --AmVault TL-30 -- 52” H x 31” W x 29.5” D -- 2100
CF5524 - 62” H --AmVault TL-30 -- 62” H x 31” W x 29.5” D -- 2474
CF6528 - 72” H --AmVault TL-30 -- 72” H x 35” W x 29.5” D -- 3206
CF7236 - 32.5”D- AmVault TL-30 - 79” H x 43” W x 32.5” D -- 4270

The smallest model will run you $2200 plus $500 shipping on the site that I found that sells them. Who knows what kind of price you'd find if you did a bit of shopping around.