topcalcs
Topcalcs is a one-stop online shop to buy, sell or trade in refurbished graphing calculators from top brands like Texas Instruments, HP and Casio. Our mission is to save our valued customers money, while minimizing e-waste and helping save the planet.
Brooklyn Heights, US · prices in USD · ships to 1 countries. Catalogue read from topcalcs.com's own public product feed on 2026-08-07. Every figure below is an observation from that feed, not an estimate.
Sales estimate
Derived from stock levels falling between polls, over 2 observed days. Intervals where stock rose, or where a variant sat at the store's inventory ceiling, are discarded rather than counted as zero sales.
| Date | Units sold | Est. revenue | Method | Catalogue read | Discarded |
|---|---|---|---|---|---|
| 2026-09-12 | 0 | not measurable | index only | — | 00 |
| 2026-08-31 | 0 | not measurable | index only | — | 00 |
An estimate, and the page shows what it rests on: which method produced each day, how much of the catalogue could be read, and how many intervals were thrown away. A day marked not measurable is not a day without sales — it is a day we could not defend a number for.
Store facts
Brands carried
Matched on the store's own brand field, so these are exact — not guessed from product names.
Products
Data collected from topcalcs.com's public product feed. Not affiliated with or endorsed by this store. Request removal.