10 cents is cost. I know of a fee who meet some of the criteria, MBK , Killer (on its way so it's pending) , and ECB (which meets it but not for me). There are more I am sure.
The actual cost for juice really depends on the size of the vendor. For some, it may be $0.10 for others it may be considerably more. Bulk buying reduces costs while buying small bottles of this and that cost more than it's really worth, for the vendor or for DIY, IMO. That's why I buy PG/VG by the gallon, flavors in no less than 4oz bottles (except those I'm testing or never tried) and bottles by the 100's.
If I pulled the basics from existing prices that I'm paying (which includes shipping - you have to include that, it's a cost to you which affects your DIY costs), I'd see the following:
PG - ~$0.01/ml
VG - ~$0.01/ml
Nic - ~$0.14-$0.18/ml
Flavoring - ~$0.12-$0.32/ml
Bottles & Caps - $0.35/each (15, 30 and 50ml)
So for one bottle of 15ml, the costs average $0.60 without the bottle and $0.95 with a bottle. It's going to be hard to reduce the cost of PG/VG to lower than above, which includes shipping. The nic is bought in 500mg/ml bottles, flavoring in 4oz bottles and bottles and caps in quantities of 100 of each size.
With that, most vendor costs are not $0.10 for a final product or $0.10 per ml, but the pricing reflects what that individual needs to see in order to pay themselves, their employees, their supplies & costs and to stay in business.
To the OP, if cost is the biggest issue for you, save up $200-$250 and invest in DIY. You can buy a 500mg/ml bottle of 100mg/ml nicotine, a gallon of PG & VG, an assortment of flavors, syringes, gloves (to handle the nicotine due to strength) and bottles. If someone has to make it for you, the costs are going to be inflated. It's simply the cost of buying from a business.