Last time I checked, HobbyKing had a 6S 10Ah pack for 69$, which means you can get 20Ah 12S for 276$, this is 80% of the capacity, but at 1/3 of the cost.
Yeah i had my eye on those graphene 15C beauties for half the price for some time now… 2 bad it’s either out of stock or doesnt want to be added to shopping cart 
My bad misunderstood to capacity.
Lipo 20[Ah]/276$ = 0.072 Ah/$
Li ion 25[Ah]/840$ = 0.029 Ah/$
How is lipo 5 times more expencive? o.O
I’m embarrassed, I got confused on capacity.
You got to swap numbers, to calculate Ah x $!
840/25=33.6Ah per $!!
Vs. 13.something of Lipos.
Lipo are cheaper but safety etc are to be considered also
I would love to buy 33.6 Ah for 1$ 
Slight diversion from the main subject but what are trusted and cheap (I know it seem like a either-or situation) source for Li-ion battery?
Lipo are not cheaper than 18650 , just need to buy at first more cell 18650 for a correct discharge rate but at the end you get a higher capacity pack and it is cheaper ( spot welder less)
Lipo is the easy way good for testing but at the end not so cheap if you built 2-3 pack yourseft of 30q or 25r …
2 people i know nearby me got 4€ deal for Sony VTC 3Ah i think. If ure in europe i can ask for a shop name, idk how marketing goes on this forum. I think shop was in Netherlands.
EDIT:
https://eu.nkon.nl/
And which is more important, safer! I think most of “top” 18650’s have internal fuse.
Nice explanation of the inside of Li-ion cells, and why not to buy cheap or untrusted sellers.
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You’re right. The other way around…ah!ah!
I rly wish u were correct 
I got 0 knowlage about the seller. I do know 2 people are very happy with pricing and Sony cells they bought. Also, user reviews of cells were good and a bit better “bang for the buck” than Samsung25R which every1 here is praising. Just my 2 cents
Stil got 400 high cycle numbed cells for sale : ). 500€. Great quality, meant for long lifetime as power walls or RV batteries. Current is decent.
When you are looking for 18650 cells, find a company that will do wholesale! If you order enough cells they will give you a wholesale price which can work out as low as £2.35 a cell.
I Have a bigger dilemma because I can get tattu 6S 12000mAh (with around 10 cycles) for around £60 a pack from a company that used to use them for their drones.
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Thats freakin bargain if cycles are true!
@Yinnon_Haviv Nice battery. How are you finding it? Everything working out OK? How much ride time do you get?
Unfortunately I didn’t use it yet. I still have a leak in my engine pod that I need to work on (project was on hold for the last few weeks). Will hopefully resume soon.
How is that battery working out for you?