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$40
3 months of use. Comes with an additional new filter ($13) for free
Amazon Price: $87.95
https://www.amazon.com/Jarden-HAP9415-UA-HEPA-type-Purifier-Visipure/dp/B00NF05FMU/ref=sr_1_34?ie=UTF8&qid=1465947674&sr=8-34&keywords=holmes+air+purifier+hepa+type
For other items look at:
https://docs.google.com/a/stanford.edu/spreadsheets/d/1ictJtIbNTHO71ZY3gqBDUhevus6qjse2XONWG3GxFSc/edit?usp=sharing
Please do not message this poster about other commercial services.