Gallon of USP PG at Tractor Supply Co. (or other farm supply store) is about $20 in store. You can get 6 ounce bottles of USP VG at most pharmacies or Wal-Mart (look in the skin care, hand care sections) for about $3.
buy 5 bottles of VG to go with the gallon of PG and you have plenty of
juice for about $40 with no shipping. I doubt you can get any cheaper than that and no waiting for delivery! Town 15 miles from me has a TSC across the road from a WalMart, so I can be done and gone in 15 minutes.
Forgot to mention that some Walmart stores carry some Lorann's flavoring in the dram size bottles - check the spice/flavoring aisle AND the craft section (cake and candy supplies).