Synchronizing a master price to other worksheets

I am a contractor and use excel to bid projects: i.e. decks
The spreadsheet that i created has every item listed that I could use in building a deck and currently I just enter the quantity amount and get a result based on the price of an item that is already listed. The problem I come across a couple of times a year is that the lumber prices change and I then have to go to each sheet and update. I would like to have a master sheet that I can manipulate the addition of rows, columns, prices, etc. and then have those changes be reflected on the bid sheets that i currently have AND any other sheets that I add in the future. If possible can you lock a certain sheet so that it cannot be changed when the master sheet is updated? I ask this so that if I have given a customer a bid last week when prices were let's say $10 and now they are $13 I want to honor the initial bid for a certain period of time.There is also a reset button that may be a little easier to do than what I have , anyway I hope this makes some sense.

Thank you in advance

Mark