A couple targets near me have this small single serve Keurig machine on clearance for $20.98, some targets hat it as low as $8.98. Use 15% off Cartwheel coupon for additional savings (expires today). It also comes with a filter to use your own grounds, which worked surprisingly well for me.
I've only used it today, but it brewed surprisingly fast and effective. No need to wait for the water to heat up. Very compact machine. Can't speak too much to the quality, amazon has mixed reviews. Can't beat the price though, especially if you're using it occasionally like me.