All tartan bands are held to the same standard.
A 3 piece band should never total more than £1000.
A four piece band should never total more than £1500.
A five piece should never total more than £1700.
these general terms don't account for travelling expenses, however they are accurate enough to protect you from con artists! We have heard of 3 piece groups charge £1400 for a 3 hour performance. It's rediculous. However if you don't shop around various bands then you cannot gauge the price or worth of a 3 piece. This isn't supposed to be like shopping for car insurance - it's your wedding!!! Agencies are great - they provide bands that have had to go through various (expensive) measures to promote themselves, and prove they are worth the money. Being on an agency removes a bands ability to over charge directly. They can ask you for any sum directly, where as here on Tartan - they all have a set fee which does not alter regardless of season or schedule.
Here here on Tartan you can find a group from £325, soloists duets, trios, 4 -10 piece! Hopefully this answers "How much does a wedding band cost?"