Hey! It's better to colour it after you have had a perm. But normally when you have a perm you should wait 2 weeks afterwards until you permanently colour it, to make sure it maintains in good condition and give your hair a break from being chemically treated. If you colour you hair before you perm it, it can strip some of the colour out, and won't look it's best. A perm in the area where I live normally costs a bout £40.00-£45.00 for just the actual perm, then if you want it cut & finished afterwards, it makes it up to about £65.00-£70.00. Have a look on my work's website http://www.profilehairdorchester.co.uk
Hope this helps you!