My small town has a DIY shop in it about 2 minutes walk from me. It is basically an old guy in a rather messy and run down looking shop from the outside. Then you go in and it is an alladin's cave of stuff and mostly cheaper than B&Q or Homebase. I intend to look at meths prices there when I get a chance as I reckon it would be better than B&Q.
I tend to get mine from local stores in the area I'm walking in. For example £1.99 for a 500ml at a general store in Eskdale area once. Not cheap but it is supporting the local store in that area. Plus I don't tend to go through meths so much these days. Went back to gas for a while.