Tongue piercing prices vary from shop to place to area.
I live in the SouthWest so it is fairly average. We have a store here called Blue Banana and there are various stores like this over the UK and they charge about £35 for the piercing, advice and the bar you have. You then get charged maybe say about another 5 quid for the bar they will change 3/4 weeks later (for the right size).
However I went to a small family run tattoo and piercing parlour and it was £30 for the piercer's time, advice, piercing, the first bar AND INCLUDING the second tongue bar of the right size in my second visit. I did not have to pay extra!!
Obviously those were 2 shops I had looked into. There is another called Tribal Voice which is similar to Blue Banana and had similar system of paying.
I would advise you to use a small family run parlour rather than a well known place as many people including myself have been infected from big places like them. Ask to see the family run business' certificates of hygeine and piercing etc. Ask them what they will do to you and what the price includes.
Good lick :D
peircings are around the same everywere... generally for a tounge peircings your going to pay between $40 and $60 any lower and you should take a good look around to see if there qualified any higher and you should also do the same, or shop around for a better price if you want
I saw one place for around 28 quid in london.. I think they range from around 25-40 depending on the place