"Pet supplies are definitely worth checking," said Pavini.
For example, a 20-pound bag of cat litter was $8.99 at Pavini's local Safeway when she used her rewards cards. On Amazon, it was $11.99 — that's a $3 difference.
Even if you don't have a Safeway nearby, she suggests checking prices at any local grocery store, as most have rewards cards.
"Everyone has to do a rewards card for grocery shopping, without a doubt," she said.
And don't forget pet stores for all pet supplies. While they have a reputation of being pricey, pet stores often have loyalty programs and rewards you can take advantage of, Pavini said.