Newegg offers the Patriot 64GB LX Series UHS-I Class 10 Secure Digital Extended-Capacity SDXC Card, model no. PSF64GSDXC10, for $24.99. This $5 mail-in rebate drops the price to $19.99. With free shipping, that's the lowest total price we could find by $15, although we saw it for $5 less a month ago. It features read speeds of up to 40MB/sec. Deal ends September 3.