piatkow - 9:00 am on Sep 29, 2010 (gmt 0)
There are too many factors that we don't know here.
If parts or materials are imported from a country with a stronger currency then prices will have gone up.
There are several commodities that are in shortage internationally at the moment.
It is poor business not to advise you of such a substantial price change and an explanation should have been provided but in the current economic conditions I wouldn't dismiss it as profiteering on their part. I took a hit on printing (I am a magazine editor) earlier this year because the weak pound affected the wholesale price of paper but my printer was very apologetic and explained fully.