Techno.Trading.House via eBay offers the Huawei Stereo Bluetooth Speaker in White, model no. AM105, for $24.98 with free shipping. That's the lowest total price we could find by $23, outside of the mention below. It features a frequency response of 75Hz to 15kHz, Bluetooth, auxiliary input, microSD card slot, and playtime of over five hours at 75% volume.
A close price: Breed via eBay has it in more colors for $29.99 with free shipping.