Nielsen Homescan opens for new applicants every few months. They are now accepting applications. Click here to apply.
If you are selected, they send you a scanner and you scan the grocery items UPC codes and that transmits the info to them. You then earn points and can get some great rewards. I have been on the waiting list for about 2 years but you should still give it a shot. They may be accepting panelist in your area.
Let me know if any of you get in!