How a Simple Black Friday “Stamp Card” Idea Turned Into My Side Hustle
I run a small coffee shop in a college neighborhood, and last Black Friday I decided not to do the usual one-day discount chaos.
Instead, I tried something simple: a week-long stamp card promo.
Each visit earned a stamp.
After five stamps, customers got a limited Y2K-style mug and a free drink.
The goal wasn’t big discounts — it was repeat visits.
And it worked.
That week’s sales were up around 40% compared to the year before, and we handed out roughly 200 mugs to regulars.
The Unexpected Part
I completely underestimated how much people would love the mug.
It was a simple lime-green design with pixel-style text. Nothing fancy. I ordered 250 mugs from a local printer, assuming I’d have leftovers for months.
They were gone in four days.
Then the DMs started.
People asked if they could buy the mug online:
- Students who missed the promo
- Locals who came too late
- Even people who had moved out of town
Turning It Into a Side Hustle
In December, I put the remaining 50 mugs on our website for $18.
They sold out overnight.
That’s when it clicked.
This spring, I did a second run:
- 300 mugs
- Priced at $22
- Soft-launched on Instagram (a few stories + one reel)
I didn’t push it hard at all.
That batch sold out in about three weeks, bringing in:
- ~$5.4k in sales
- ~$2.3k profit after costs
Where It’s At Now
It’s not a full merch brand, and I don’t want it to be.
But it’s become a mini side hustle that helps cover rent during slower months — and honestly, I don’t know if I could’ve kept the shop open without that extra boost.
All of this came from a promo reward I thought was just a fun extra.
Takeaway
Sometimes side hustles don’t start as “business ideas.”
They start as:
- A small experiment
- A loyalty reward
- Something people unexpectedly love
And if you pay attention, they can turn into something real.
Still kind of blown away that this worked.