Many Pound shops in the UK sell vape Liquid - as paradoxically does Iceland which is a frozen food retailer and a 10 ml bottle comes in around £0.95 - £1.00.
Often the brand sold is "88 Vape" - if you google it you can even get a data sheet and its certificates from the maker. Dependent on the strength it is offered in either 50/50 PG/VG - or 70/30 VG/PG.
It's so cheap and actually so good half the time I don't bother making my own any more ( I use the Menthol or Menthol Chill )
Under the 88 Vape Lable they also sell basic vape devices akin to the old Ego CE4's that so many of us started with.
These do vape "wet" and can be run well past the time they should be because of their silica wicks. Running a wick like that too long will give me a throaty cough; using VG at 70% will give me a chesty cough.
Obviously I can only talk from my own personal experience, others may differ.
To me the answer to the OP's problem is to try 50/50 PG/VG liquid and when money permits to buy a better device.