Can I use my receipts from online purchases from amazon, walmart etc?

No.  You can only add a couple large purchases to the sales tax table.

You can only add

1.  A Motor Vehicle

2.  Aircraft or Boat

3.  A Home

Major purchases do NOT include:

-Furniture

-Jewelry

-Home electronics

-Appliances

for non-major purchases you can use either your receipts or the tables.