You can still get lucky enough to find a Treasure Hunt on the rack or in one of those big bins at the store, but it is increasingly rare. When employees at some stores caught on to the resale market for certain Hot Wheels they started going through boxes and cherry picking the special cars before shelving the run of the mill leftovers. When management at some stores heard about this and realized that it was alienating customers, they started making it against the rules for employees to take anything for themselves from shipments. A few of the more savvy stores even made special events out of new shipment days. If you get there early and sign up for their lottery of sorts, you can win the chance to open a brand new box all by yourself. You then have the opportunity to buy any, or all of the cars in that box that you want to.
So if you want the best chance to add one of these treasures to your collection I suggest that you get to know the stores in your area. Talk to the managers and find out what their policies are concerning employee purchases, then find out when new shipment arrive and if that store has any special event days for Hot Wheels fans. Once you arm yourself with this knowledge you are ready to go on the hunt. Just be sure to keep your eyes peeled for that tell-tale green stripe. I have even been lucky enough to catch one lurking behind a toothbrush in a checkout lane at the grocery store. Happy Hunting!