Just a heads up in regards to Youkai Academy, I don't think Gavin put out the entire fire, just the part of it that was in the area around where he was. This is because he didn't want to electrocute any unintended targets with his electric attack(s).
It was still quite a bit of water, but not enough to put out the fire in its entirety.
Thank you, this helped a lot in making me realize some things, mainly through the Anneal Blade that the first floor isn't exclusively noob equipment and poor players (relatively) as I had previously thought considering that it's a 100 floor game.
Here's what I found in volume 1, 2, and Side Stories:
Asuna's House: 4 Million Col
Ragout Rabbit's Meat: 1 Million Col (minimum)
Dust Lizard's Hide: 25 for 500 (Agil's Price)
Fire-Breathing Popcorn: 10 Col (Per cup)
Private Rooms: 100 Col (they vary depending on the floor)
Anneal Blade: 15,000 Col
...So specifics in that respect are pretty scarce. A lot of times they'll give vague details about how much something costs, and it's clear that people spend large sums on forging (such as the Anneal Blade, a rare sword, costing around Twenty Thousand to enhance its stats by +6 "safely", as Kirito puts it). It's worth noting that a worm, a minor creature, nets 30 Col per.
The Light Novels seem to emphasize (or rather, the Side Stories do) that the market swishes and sways quite a bit, so it generally follows real laws of supply and demand. That's after checking the entirety of the SAO arc entries for usage of Col. I'll check to see if I missed anything later. Sorry I couldn't find that much -.-
Sorry to impose but can you remember any prices mentioned in the SAO light novels? For anything? I just want something official to base prices off of. Also do you remember any mentions of health values or boost values? I know it's probably a lot, so you don't need to if you don't want to but I'd appreciate it.