Maybe you could try buying some stuff online from places that have a good rep here, and always keep a good back-up. Buying out of some place that isn't even a vape shop is not a great idea. Would you buy asthma inhalers from a backstreet chop-shop garage? Would you buy your cardiac medication from a pig farm?
If you're going to inhale stuff then it should at least be made by someone who has some sort of investment in their reputation and enough turnover to source reasonable materials and do the required testing. If you can't afford real e-liquid then don't buy from some kind of dollar a bottle merchant, it's safer to make it yourself. Get Glycerine USP and Propylene Glycol USP (PG) from a pharmacy, 60mg strength nic base online from a reputable vendor, and very simple flavours like menthol and peppermint locally or online. You can get really good flavours from some of the places recommended in the DIY e-liquid forum/s here.
You can make refills cheaper than the cheapest pawn shop or pig farm if that's what you need, and at least you'll know what went into it, and it won't have been made from the world's cheapest ingredients, mixed in a pawned sink or a pig slop bucket.