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I think the litre I made recently cost less than £30 all in.
Make My Vape is good for PG/VG (i use 100% VG) and nicotine (you might now have to buy bundles of 10ml bottles due to the new regs but play around with the calculator to see).
MMV only does 10ml bottles of flavours. WHich is fine if you are making batches of smaller amounts but a pain if make big volumes of single flavours. I now get a larger amount of a single flavour from Rainbow Vapes - same brand of flavouring as sold by MMV.
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Darkstar and Chefs Flavours are my goto sites for concentrates and PG/VG/Nic.
I've recently started using Fogstar for batteries. Not much more expensive than the Chinese sites and more reliable / quicker delivery.
I've found it the handiest for most things. Although I haven't had to buy nicotine since the restrictions came in so don't know where the best value place is for that yet. Make My Vape has a nice calculator which now offers weight calculations so it's a piece of piss to make huge amounts of liquid.