Here are a few types of shops which can reduce your taxable income and your regular expenses.
Grocery- If you coupon, use these for non-couponed shopping, like meat, deli, produce
Gas stations- All that shopping driving means you go through more!
Shoe stores- Shop clearance and buy for next year.
Clothing stores (Even if you don't buy clothes regularly, they're good for stocking up on basics that are regularly replaced, like socks, underwear, tanks)
Oil changes- All that shopping driving means these happen more frequently
Cell phone accessory shops- Spare phone batteries, car chargers, etc... all good things to have extras.
Restaurant shops- Every lunch/dinner out means less grocery expenses buying ingredients to make a meal
Hair salons- These could lower expenses for your husband, if he gets them done regularly.
Bookstore shops: Either for yourself or as a gift
Massage shops- Treat yourself.
Shopping just isn't fun unless you reward yourself every once in awhile, and hey... you're getting reimbursed! Guilt-free reward.
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Plan the work. Work the plan.