As a general rule of thumb, solo shoppers at Costco should skip the super-perishable items, like bagged greens, that turn soggy in days. The same goes for meat or dairy items.

Instead, the perfect candidates are the items you know you go through quickly and that don't have a shelf life you have to worry about, like toiletries and canned goods.

You can also adopt a community-minded approach and shop at Costco when you need to buy for a group — whether it be friends, family, or co-workers — and split costs.