1mth, 1qtr, 1yr & 5yr Graphs using Google charts API.
Generating and caching graphs on server at required intervals.
Daily historical pricing data would be provided.
Live price data would be extracted from a .csv file provided.
Widget would need to include web site link in <no-script> tag.
AJAX auto refresh of price would be preferred.
Widget engine should be scalable, easy to add new product prices, with the addition of a different .csv file.
Please PM should you require further clarification.