[Jmac]

Should be pretty simple with PivotCharts ...

Column A = Item Name
Column B = Price
Column C = Date

Highlight A1 to C? (end of table), select Format as Table (colour scheme doesn't matter, just choose whatever looks best to you).

Once you've formatted it as a table, Insert > PivotTable > PivotChart

On the right, put Item in Legends Fields, Date in Axis Fields, and Price in Values.

Right-Click on any empty space in the Chart, then select Change Chart Type, select a line graph.

On the right side of the chart, you'll see a grey box with Item and a down arrow next to it. If you click on that, you can select which items you would like to have displayed ...

See attachments for visuals ...