They do offer this tank, with a lifetime warranty, still. Home Depot doesn't have any deals going right this second, but they are going to be offering the 24 month no interest deal I guess shortly, the guy told me about that as well.My story...
A few years back my old (1996) 80 gal electric hot water heater started doing whats yours is doing so I called to get some quotes. I was given many suggestions from the tankless ( My Main Panel box is limited so $$$ to upgrade power ) I considered tankless Natural Gas ( my house does not have gas but its at the street ) Lots of trouble and time involved.
A few contractors suggested smaller 50 gal, one guy suggest (2) 50 gal (was a time 80 gal was hard to find or the only option was a big 80 gal hot water heater that had a heat pump on top but lots of space like a garage is required for that , My existing heater is under the stairs in a closet, Is 80 gal as I have a garden tube and at the time a big family so I had to have 80 gal and one that would fit in the closet!
After some research I decided on the ( it was a 75, 80 or 85 gal I can't remember ) Marathon Brand Hot Water Heater!
It has a (poly tank) and a great warranty so less chance of leaking and NO RUSTING!
A few years back it was $2,400 installed ( More now i'm sure )
I did not originally go through Home Depot as I called the install Company direct but when I asked do you offer any 0% he asked if I had a Home Depot Card ( I did ) He was able to do 24 months at 0% so I paid $100 a month and it was paid off in 2 years! PERFECT!!!! Still working great and I noticed my old 80 gal was warn to the touch this Marathon is cool to the touch!
I was very happy with my choice and is still working PERFECT!
Look into the Marathon!
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There's definitely a certain appeal to having a tank that won't rust out. How old is yours now, have you had to have any repairs done to it?