I'm not sure about an actual juice, but TPA has a Mountain Dew flavor that is absolutely amazing. I mixed it with some black cherry and had a Code Red that's hard to put down. Had to make a no-nic batch so I wouldn't give myself headaches from too much nic.
Either way, if you're up for some DIY,
1oz flavor will cost you $5.
4oz PG $7,
4oz VG $5,
60ml of 36mg nic $7.
Total cost $24
Using the calculator based on the following:
PG/VG ratio 85/15
Target Nic 24mg
15% flavoring
You'd get 90ml's or 3oz of ejuice and would have used:
NIC = All 60ml of NIC (time to reorder) another $7
PG = 3ml leaving you with essentially a whole bottle of PG
VG = 13.5ml leaving you with a little more than 3oz
Mtn Dew Flavor = 13.5 leaving you with 16ml
All for $24
30ml of Ejuice will cost you about $14 so $90 would cost $42. Once that bottle is gone, you're ordering again. You just saved yourself $18 DIY. AND.... you can make another 90ml's for $7 (cost of NIC)
Of course these numbers change depending on the situation. Maybe you don't need VG, so cheaper. Maybe you need less flavoring, so cheaper. Maybe you need more? Still less money than buying juice. Bigger bottles cost more but last longer.
Upside:
Save money
Fun to do
You decide what tastes good to you
Downside:
Addicting as hell!
Because it's addicting, you'd probably end up spending a lot of money.
So if you love the drink that much and think you could vape a lot of mtn dew. I'd go with DIY.
My math here is probably all jacked up, but I'm sure some smart guy will correct me.