This is a link to my favorite. I carried my youngest in this carrier until well after his second birthday. It's also nice because he's on your back so he's not getting into everything. Plus baby wearing supposed to be good for them, right?
Dedicate specific toys for the car and shopping trips. Only let him play with those toys when he's either in the car of the shopping cart. I would also use a sling or kid backpack during this stage to keep them truly contained.
You could also make a shopping list for him with pictures of things on your list for him to help find. Keeping him distracted will keep him contained.
Or do everything you can to NOT take him shopping until he's a little bigger and more willing to hang out.
Ask any pregnant woman and she will tell you that now she’s expecting what once smelled delicious - like roasting coffee beans for example, has suddenly become the one smell that induces an overwhelming feeling of nausea. For some women the pregnant nose goes into smell overdrive with incredible detection ability, in fact increased smell sensitivity can save lives. Just ask your local gas company – pregnant…