Massdrop offers the Samson CT20 Clip-On Guitar Tuner for $14.99 with free shipping. (Best Buy charges the same via ship-to-store pickup.) That's tied with our January mention and the lowest total price we could find by $5. It features a color LCD display, pitch calibration from A410 to 490Hz, and chromatic, guitar, and bass tuning modes. Deal ends May 5.
Note: The expected shipping date is May 18.