Ibotta currently has a rebate on Breathe Right Strips at Walmart for $3.00. Coupons.com (CDC) has a coupon for $1.75 off any Breathe Right Strip.
Walmart sells the cheapest package for $4.46 (Breathe Right Clear for Sensitive Skin Small/Medium 30 count). Unfortunately, my stores don't carry it. But if yours does, the price would be $4.46 - $1.75 coupon - $3.00 Ibotta = $.29 moneymaker.
The CDC app has this coupon, too. It also says it works for Online Grocery orders, so you may be able to order the item and get the credit back from CDC. I have never tried this.
Let us know if you find this cheaper variety or have gotten CDC app credit from an Online Order.
The only $4.46 strips I have are the shippable ones, so there is a $5.99 shipping fee - $10.45 total.
It appears this is a clearance price. Brickseek link below; enter your zip code.
All my stores were OOS; with prices of between $1 and $3.