Price a Textbook Three Ways: Buy, Rent, or Buy and Sell It Back — Free
A $148 textbook is not a $148 cost if it sells back for $52 in May, and a $46 rental is not cheap if the access code you need for the online homework costs $79 separately. Three options, five numbers, one semester. This label prices all three routes on the same basis — what leaves your account and never comes back — and prints the difference.
The proof surface
Free path: the label computes locally in the browser with no key and no account. Where an AI step helps, any free chat assistant works — Google AI Studio's free tier and Groq's free tier were both no-card and rate-limited when this page was reviewed on 2026-09-13 (limits change; check before you rely on them).
Why the flat version breaks
A shelf price and a rental fee are not comparable numbers: one includes an asset you can sell and an access code you may already own, the other includes neither and ends in June. Reducing all three routes to one figure — the net cost of the semester — is the only way the comparison means anything.
How to use the textbook price label in four passes
It is the number that reorders this comparison. A cheap rental with a $79 code costs more than an expensive purchase with the code bundled, and the reading list rarely says which applies.
Ask the campus shop what they will pay in May for this edition, or check what the current used price is. A new edition published mid-year takes the sell-back value to zero, which is worth knowing before you buy.
Some rentals forbid highlighting, some charge for late returns, and some include the code while others do not. Write the shipping and any code cost into the rental figure so the label compares like with like.
If buying new nets out at $96 for the semester, a used copy above that is a bad deal and one below it is a good one. That ceiling is the only number you need in the second-hand group chat.
SAMPLE DATA, NOT A VERIFIED CLAIM: BIOL1204 Cell Biology · 9th edition, autumn 2026 · new $148 · buy-back $52 · rental $46 with free shipping · no access code needed. Replace these values with your own source before you rely on anything.
What breaks first
Comparing a rental with a purchase at sticker price
One is a semester's use, the other is an asset with a resale value. Without the sell-back figure the purchase always looks dearer, which is why the label subtracts it.
Buying the wrong edition to save money
Page numbers, problem sets and the reading list change between editions. A $60 saving that costs you the wrong chapter every week is not a saving.
Assuming the library copy will be available
Short-loan copies on a 120-student module are a queue, not a plan. Check the hold list before the semester starts, and price the book on the assumption you need your own.
What you pay otherwise
| The usual route | What it leaves out | Cost |
|---|---|---|
| A textbook subscription service | Unlimited access to a catalogue, for a monthly fee across the year | a subscription that outlives the module |
| Buying new without checking the buy-back | The full sticker price for a book worth a third of it in May | £96 of value left on a shelf |
| Renting without the access code | The homework platform is where the marks are | a $79 code bought in week three |
| This page + the free textbook price label | Computed in your tab, result on screen before you type anything | $0 |
Try the free textbook price label
A $148 textbook with a $52 buy-back is already priced against a $46 rental on one label, with the semester's net difference boxed on the handling line. Add a $79 access code to the rental side and the ranking flips.
Open the free textbook price label →Keep the work if you will use it again
All three routes, the net semester cost, the difference and the exclusions, plus copy and share-link, with no account.
The on-screen result is free and repeatable forever. The one-time tier adds a tangible file you keep and the saved history that comes with it; it never removes or degrades the free result.
Boundary: This does arithmetic on the prices you type in; it is not a purchase, it cannot verify a buy-back offer, a rental's terms or an edition's availability, and prices change. Check the ISBN against your reading list, the buy-back figure with the shop, and the rental's rules with the supplier before you commit.