As far as I can tell, you are out of luck. Burpee was the developer, grower and seller of this variety and they have discontinued it. No one else seems to have carried it. It was sold by Amazon, however they have discontinued it also. It's a hybrid so even if you could locate some seed to grow out, it would do you no good to try to save seed for later planting. I'm sorry, it's so hard to lose a favorite variety like that.
Jim of Seedman has an eggplant that he lists as a "baby" variety. Perhaps it will help? Here is a copy of his listing and a link to it.

Eggplant
G026 Baby Eggplant
A new mini vegetable. Plants are compact and bear loads of miniature fruit that can be deep fried whole. One of the new rages in miniature veggies. Perfect for container raising. Fruits are very tasty.
20 seeds $1.95

I'm sorry I was unable to help more. Perhaps someone else can do more for you.

Carole

Here is a link that might be useful: Seedman website and eggplant listing.

Carole, thanks for the reply. I pretty much figured I was out of luck, but in the spirit of leaving no stone unturned, I thought I'd post here...just in case. I have located a couple of round Italian varieties that I plan to try, one an heirloom variety, so if we like it I can save seed. Thanks also for the link, I checked it out. I'm looking for a larger variety though. Guess this summer will be field trials of several varieties to try to find a replacement.

Take a look at Seeds From Italy, growitalian.com's, eggplants. The last one on their list looks an awful lot like the one you're looking for. Perhaps it's the real McCoy? Maybe Burpee's wasn't a hybrid after all.....

I hope you find what you're looking for.

By the way, 'mind telling us what you liked so much about the Blue Marble?

Here is a link that might be useful: Blue Marble by another name?

marquette, thanks for the link. That looks very much like Blue Marble. I'll certainly be giving them a try. We like the mild flavor, no bitterness,not to seedy and could get fairly large. The shape also made them nice for making rollitini.Think I'll head back over to the site and see what else looks good. Thanks again.

10-15 years ago I began growing a pole bean hybrid developed by Burpee called "Early riser". Had great luck with it for several years, then they discontinued it. It took a couple of years to find it again, sold by Shepard seeds as "Kwintus" I found it totally by reading descriptions, and have also found it named "Northeaster"
The point is, perhaps Burpee sold the eggplant to someone else though I'm sure this happens less today with all the seed companies clotting and getting bigger and trimming their offerings to mostly be the "universal best sellers."
Last year I ordered from Gourmet seeds International... they offer seed from a number of European and Asian companies..

Here is a link that might be useful: gourmet seed international

Thanks for the link, looks like another great site. Now I'm adding veggies to my list of plant addictions.

Hi hostaholic2,
I was out wandering through the seed sites when I came upon Amishland Heirloom Seeds. They have a fascinating collection of eggplant seeds so guess who I thought of!
These are not your standard Dusky or Black Beautys. Take a look, they're not Blue Marble (sorry), but they are very interesting. They have eggplants from Sri Lanka, India, China, Africa, and other places. They also have an heirloom eggplant seed mixture.
I'm having fun just reading about them and I thought you might also.
Carole

Here is a link that might be useful: Amishland Seeds - Eggplants

Carole, thanks for the link. Another fun website to wander through while I wait for spring.