Ack, that's still too much!

A Scotsman goes to the dentist and asks how much it is for an
extraction.
"£85 for an extraction sir" was the dentists reply.
"Och huv ye no got anything cheaper", replies the Scotsman getting
agitated.
"But that's the normal charge for an extraction sir", said the dentist.
"What about if you didn't use any anaesthetic?", asked the Scotsman
hopefully.
"Well it's highly unusual sir, but if that's what you want, I suppose I
can do it for £70", said the dentist.
"Hmmmm, what about if you used one of your dentist trainees and still
without anaesthetic", said the Scotsman,
"Well it's possible but they are only training and I can't guarantee
their level of professionalism and it'll be a lot more painful, but I suppose
in that case we can bring the price down to say £40", said the dentist,
"Och that's still a bit much, how about if you make it a training session
and have your student do the extraction and the other students watching
and learning", said the Scotsman hopefully.
"Hmmmmm, well OK it'll be good for the students I suppose, I'll charge
you only £5 in that case", said the dentist.
"Wonderful, it's a deal" said the Scotsman..."Can you book the wife in
for next Tuesday"