The table$\_$array argument should identify a range of cells in the 'Product List' worksheet.

You can examine the formulas created in the workshop$/$tutorial in cells B$5$ and B$12$ of the W$1$ worksheet as an example.

Consider using $ to establish absolute references for columns and$/$or rows that should not change when you copy$/$paste formulas. Be careful, not all arguments in this VLOOKUP should be absolute references.

If you see #N$/$A values appear as prices, then you need to fix the arguments of VLOOKUP, or fix the items number in column A$.$