I need to compare two datasets - product pricing from 2010 and compare it to today's existing prices. Each is listed on separate spreadsheets but can be easily combined into a single spreadsheet (however, there are more than 7,000 prices to compare). My desire is to run a monthly report where I can show which part numbers (with their new prices). Not all 7,000 prices have changed (I estimate 200). Also, not all 7,000 part numbers are ordered every month. My initial thinking is to perform a VLOOKUP. Are there any thoughts on the best way to accomplish my objective and allow me to do so on a monthly basis? Thank you.