Tired of looking for tyres?

My archaic Audi needs a fresh set of rubber for the rear so you'd assume that the logical thing to do is to bimble to National Tyres or Kwik-Fit and Bob's you're Uncle...or not? My sixteen year-old 80 is well-maintained mostly by me and is worth an embarrassing £500 so I'm always looking at ways to cut costs whilst keeping the car safe and fuel-efficient. I've had part-worn tyres fitted before at around £20 each but they had been puncture-patched and didn't reassure me on the motorway. The second option is visiting Mr.Scrappy to look for the correct set that are damage-free; I bought a pair for £30 fitted that had been taken off a scrapped car and have had no problems six months on. Anyway, continuing from where I began, I searched online for, you've guessed it tyres and got a price of £90.95 that included a discount of £16.05 for rubber that sounded as if the manufacturer was a Samurai! Another website that I have discovered was http://www.tyre-shopper.co.uk/ that undercut the big boys by offering the same rubber for £40 each so £80 including VAT and fitting for two. So, in effect, I've saved £27 on two tyres that'd be doubled for four and the incredible thing is that the tyres that I ordered from tyre-shopper would be fitted by...National Tyres. Crazy!