This was BY FAR the most expensive part of my prepping, this puppy right here: https://www.duromaxpower.com/collections/digital-inverters/products/xp9000ih - it retails around 2600.
This was a splurge for the following reasons:
I opted for an inverter generator to protect my electronics (remember, I do work from home!) - I have a TV, a laptop, several other electronic items - and all in different parts of the house - so if I got a regular (non-inverter) genny, I would have had to buy several other gadgets to set up in multiple rooms to protect the electronics from surges - when I added that all up, it seemed to make sense just to buy the inverter generator and be done with it.
I was really keen on the "dual fuel" aspect - it just seems so sensible - but that does seem to amp up the price of generators also.
Due mainly to the heavy septic pump and a couple of other things, my electrician said to get at least 5000 running watts.
To find a dual fuel inverter that also had decent reviews - well, this Beautiful Blue Behemoth (LOL) was the best option I found.
It has 4 wheels, and can certainly be rolled around. But, because of it's size, I made a decision to buy a cover and store it outside (under my deck) rather than moving it in and out of my walkout basement (as there could be heavy snow, etc.). Again, just catering to my own unique situations.
Edit: also, an electronic start was a "MUST HAVE" for me. I can't be out there yanking a pull cord, no way! For some of you, that might not matter.
All in all, when everything is said and done - the equipment (genny, cover, chain/lock, cable, associated electrical work, used propane tank, installation of tank, and now probably a small grill, too!) will be about 4-4.5K (but with 80% of that investment portable to my next house, so I'm cool with that).
I spent another 1-1.5K for non-perishable food, water, water filter, cleaning supplies, medications, paper products, etc. - but again, I was a bare cupboards kind of gal, so I was building from "zero". I also spread this out over the last 1-2 years - doing it through really good sales. I have about 4-6 months of meals in my house. And the ability, as stated, to produce potable water once the bottled stuff runs out.
And, I spent quite a bit on ammo in the last few years (but nearly all of it was when prices were CHEAP). I followed good "buy it cheap, stack it deep" advice!
Now, I know, that all probably sounds like a shit ton of money to some people, lol. But, honestly? That second category (the food/supplies) and the 3rd category (the ammo) are items I would buy/use over time anyway! I simply bought these items in advance - and at sale/bulk prices - so that I would have some in my own storage to draw from. So, I'm not sure I even count those 2 categories as an "extra" expense. I just completely changed my buying patterns, buying in advance and at sale prices rather than when I run out and at full price. It's really the 4+K of equipment that's "extra" - but I feel like I'm squeezing a lot of functionality out of that investment. I dare say, I think it's the best money I've ever spent - it's giving me peace of mind! And you know how when you water your grass, it finally rains?!... Well, now that I've made this investment, I'll bet I don't have a power outage for the rest of the time I'm here!