I think you're out of luck in finding a lesser priced alternative that meets your criteria. The only GC2 battery I found was a Discover SLP-GC2-12V battery, but it was $1,200 and is manufactured in China, Taiwan and Korea.
However, LiFePO4 batteries can be installed anywhere, you're not limited to your existing battery location and they can be mounted in any orientation, stacked, vertical, on their side, etc.
Some install them under the bed or in other inside locations. A storage bay is another option. Doing so will involve some re-cabling but there are distinct advantages in mounting it in a heated space such as mitigating low temperature charging issues, etc. Storage bays can probably be insulated and heated easier than your existing battery compartment.
Your existing battery location most likely is uninsulated and may even be open to the elements. You'll still need batteries with low-temp cutoff, but, if they're mounted inside, you'll be able to charge them if your heater's on. The $899 GC2 Battle Born battery doesn't have integrated heaters so they would also benefit from being mounted in a heated space. The heated version is $999 and I'd suggest considering that if you're going to mount them in your existing battery location.
https://battlebornbatteries.com/prod...d-battery-kit/
The aforementioned Will Prowse has a number of videos in which he tests various LiFePO4 batteries, including a teardown that often finds hidden flaws, disconnected or missing temperature sensors, etc. There are several batteries he recommends in the lower price ranges, Chin, SOK and others, but they're not made in the USA. These run somewhere around $500 - $600 and those at the top end will have integrated heaters to allow for charging below 32°F.
Personally, I wouldn't buy any non-Battle Born battery he hasn't fully tested and found to be a good option. The above video is pretty old so make sure you look at his more recent videos if you're interested.
Unless you're on a tight budget, you'll probably never regret buying Battle Born batteries and will probably get better customer support in the case of a problem. Even though Battle Born batteries are manufactured in Nevada, I'm wouldn't be surprised if their cells and other components were manufactured off-shore.
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