Harbor Freight has an ad in the paper for a mover's dolly for $ 7.99 instead of the regular $ 15. Maybe you can set the box on that and if needed put down some treated 2x6 boards for the runners. Probably will not need them unless on the ground.
I used to impress this gal I knew, she was 5-11 and 230lbs. I would throw her over my shoulder and carry her around. *snicker*
TDD
If you have someone who caters to used store fixturing in your area, you may be able to come up with a worn, bent, or otherwise usable chunk. These things are common where trucks are unloaded.
Get some of those "EZ Sliders" they advertize on late-night TV. They'l move 200 lbs with no problem, Just big teflon or something coated pads that you slip under the load - slide on carpet, tile, hardwood etc but not much good on rough concrete.
What's wrong with casters?
Get a couple of pillow-blocks for each end and mount pulliys on the end of axles - roll the pulleys on peices of angle iron on the ground like ^.
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