I Spent My Career Working on the Tools Retailers Use on You. Now I Show You How They Work.
Hi, I’m Erin.
Most people assume sale prices are set by someone in a back office with a calculator, that “limited time” means limited time, and that the number on the tag is the number you pay. I’ve spent many years working in marketing technology, the industry that builds the software retailers use to set prices, time promotions, and move you toward checkout. None of those things are true.
Retailers know exactly what they are doing. Once you can see the playbook, you can use it right back.
That is what ShopHappens is for.
👋 Who I Am
I worked as a project manager overseeing tons of different marketing technology projects, which meant spending my days inside the systems that shape what you see when you shop: dynamic pricing engines, email trigger platforms, cart abandonment tools, loyalty program mechanics, personalization and behavioral targeting.
None of that work is sinister. It was mostly engineers and marketers solving normal business problems. But the cumulative effect is a shopping environment designed with far more intent than most shoppers realize, and I got tired of watching people leave money on the table because nobody had told them how it worked.
I started ShopHappens in the early aughts and relaunched in 2026. I write every post here myself, with the help of my AI authoring partners. I am based in Maryland, I do the same grocery runs and back-to-school lists you do, and most of what I write about started as something I needed to figure out for my own household.
🧠 What I Know That Helps You
The stuff that feels invisible when you shop is very much by design. A few examples of what that means in practice:
Amazon prices move algorithmically, sometimes dozens of times a day, and free tools track every change. Knowing a price is at a genuine low is different from being told it is.
Cart abandonment emails exist because they work. The discount that shows up two days after you walk away is an automated response to a behavior the system was watching for. You can trigger it deliberately.
Countdown timers are frequently cosmetic. Many reset on page refresh, because urgency converts whether or not it is real.
Loyalty programs are engineered to feel more rewarding than they are. Some are worth joining. Several of the biggest are not, and the difference comes down to how the points are valued, which is a number the program rarely shows you.
Sale timing follows a merchandising calendar set a year or more in advance, built around model year turnover, seasonal shelf space, holiday promotional anchors, and fiscal quarter targets. That calendar is knowable, which is why I built a free month-by-month tool around it.
📚 What You Will Find Here
Retailer knowledge. How pricing, promotions, tracking, and loyalty systems work behind the scenes, and what to do with that information. This is the heart of the site and the part I am most qualified to write.
Money-saving strategies. Cash back apps, price tracking tools, credit card rewards, and the timing habits that compound over a year of ordinary purchases.
Seasonal buying guides. When to buy, when to wait, and what to expect from the major sale events.
Product roundups. Things worth buying, with a bias toward finds that punch above their price. When I have used something myself, I say so. When I have researched it but not tested it, I say that too.
🛠️ The Tools I Use Every Week
Rakuten: I have used this since 2009, back when it was Ebates, and have earned back over $900 in cash back at stores like Target, Sephora, and Walmart. Free, and about five minutes to set up. Here is how it works →
Ibotta: My pick for grocery and everyday essentials.
CamelCamelCamel: Free Amazon price history tracking. I check it before buying anything on Amazon over about $30. Not an affiliate link, just a tool I rely on.
💵 How ShopHappens Makes Money
I participate in the Amazon Associates program, the Rakuten referral program, Ibotta, and other affiliate partnerships. When you buy or sign up through my links, I may earn a small commission at no extra cost to you.
Nobody pays me for placement or for a positive review. When I recommend something, it is because I use it, I researched it and would use it, or I think it solves a real problem. My credibility is worth more to me than any single commission, and if I ever get something wrong I would rather you email me than lose trust in the site.
If you purchase through my links, I may earn a small commission at no extra cost to you. Thank you for your support!