Why we built StembookDeals
STEM textbooks routinely cost more per semester than groceries. Here's why we built a dedicated price-comparison tool for them — and how we stay honest about which retailer wins.
The average US undergrad in a STEM program spends $1,200+ a year on textbooks at list price. Compare that to a humanities student — most of their reading can come from a library or cheap paperback. A single edition of Griffiths' Introduction to Quantum Mechanics retails for more than some of them spend on books in an entire semester.
And yet: the same book is often 40-80% cheaper on a different retailer that very few students check.
The price-comparison gap
Generic shopping sites treat a $300 textbook like any other product — they rank it by commission, not by whether the price is actually competitive. Existing "textbook search" sites are mostly dropship resellers, not true price aggregators.
Students end up defaulting to Amazon because it's a known quantity. But Amazon's price is frequently 30-50% above AbeBooks, Alibris, or eBay for the same ISBN in comparable condition. Nobody is looking out for the buyer.
What StembookDeals does differently
One URL per book, five retailers compared. Every /textbook/[isbn] page on this site links out to Amazon, AbeBooks, eBay, Alibris, and Pearson InformIT in parallel. You click through to whichever one you want to actually buy from. We never "prefer" a retailer because they pay us more.
Ranked by price, not by commission. When we wire up live pricing (summer 2026, once Amazon's Product Advertising API unlocks for us), the cheapest option will be highlighted automatically — regardless of which affiliate network pays us the best rate. That's a rule we've built into the system from day one, not a promise we can quietly renege on.
Anchored on what's actually assigned. We index canonical STEM courses at top US programs — MIT 6.006, Stanford CS 161, Berkeley CS 170, CMU 15-213, and so on. If you know the course, you can skip straight to the exact edition required.
The honest disclosure
We do earn affiliate commission when you click through and buy something. That commission comes out of the retailer's margin, not the price you see — you pay the same whether you reach Amazon via our link or type the URL in yourself. See our full affiliate disclosure for the specifics.
What we don't do: take payment to rank one retailer above another, or hide cheaper options because they earn us less. If Alibris has the cheapest copy and we earn 40 cents on a $60 textbook there instead of 80 cents on an $80 Amazon copy — Alibris wins the top spot. Every time.
What's next
We're in the final stretch of wiring up live price fetching. In the meantime, every product page on the site gives you five side-by-side search links so you can spot the real floor yourself. Drop your email and we'll let you know the moment a textbook on your list drops below its usual range.