Eaton is hard to find in Home Depot and Lowes
Yeah, a lot of people get trapped in a "big box rut". They only see commercials for Home Depot and Lowes, the Sunday paper only has fliers from Home Depot and Lowes and sometimes Menards. For electrical, though, it pays to broaden your horizons to:
- (family owned) local hardware stores, often trading under the ACE or HWI name. They have typically been there for 100 years.
- (family owned) real lumber yards, that primarily sell building supplies. These differ from hardware stores by having a huge yard full of sheds containing lumber and other bulky building supplies you wouldn't find at a hardware store. Their lumber quality is notably better, and so are their prices.
- Electrical supply houses. Typically small businesses, a few chains like Greybar or City Electric. They are optimized for the trade, but most I hope you aren't hypnotized into thinking local family owned businesses are bad or something.
The big-box stores are notorious for only stocking top sellers. They'll sell a complex conduit system with many parts, sell the left hand bends but not the right hand bends because the computer say they're not popular enough to stock. And their praces are abominable on non-top-sellers (the stuff hardly anyone price-checks on), like 4-11/16 steel boxes.
Now, I am looking online and I am seeing very different prices.
That is typical and normal with electrical gear. I think the root problem is, you know with consumer goods, companies are eager to sell them online and lots of people want to buy online. But electrical stuff is really trade goods, and there are 3 big problems with selling that online. Other than basic basics like outlets, 99% of sales are to the trade - 99.9% for arcana like 125A breakers.
First, electrical gear is heavy, bulky and low value, so shipping charges become an outsize percentage of total purchase price. It simply makes more sense to distribute electrical gear by the truckload to local supply houses. Second, the trade already has a local supply chain who gives same day turnaround, so they wouldn't ever mail-order that stuff. Which leaves ... (third) amateurs who do not know what they are doing are the bulk of your customers, which means lots of misapplication, mis-ordering and misuse, which means lots of handholding, returns and chargebacks.
The results is totally bonkers online pricing. Anyone with good product is giving their "I don't wanna sell it" price (or to be more precise, their "I don't wanna ship it / deal with amateurs" price). They prey on non-price-sensitive people.
And anyone with good pricing is either a fool, or selling used goods or counterfeits.
I have to change my Eaton breakers at my home.
That's a fairly weird thing to do, unless you have Challenger breakers or an Eaton lineage panel with a bunch of non-Eaton breakers in it. Perhaps you should ask the opinion of experts as to whether that is necessary or what is best to do.
I'm also concerned that you're looking for a BR2125, which is a branch circuit breaker intended to feed subpanels, electric furnaces etc. It's only used as a main in a "backfeeding" situation (and you have a tie-down kit, right?) Modern Eaton panels that are "convertible" actually require a different model of main breaker.