Amazon offers the Dyson Tangle-Free Turbine Tool Vacuum Attachment, model no. 925067-06, for $38 with free shipping. (Walmart charges a few cents more.) That's tied with last week's mention as the lowest total price we could find by $12. It's compatible with all Dyson upright and canister vacuums from DC23 onward (except DC24 and cordless models). Features include elliptical counter-rotating heads with integrated brushes and an articulating base plate.
Walmart offers the Black+Decker 40V Blower / Sweeper, model no. LSWV36B, for $54.98 with free shipping. (Amazon and Target charge the same.) That's the lowest total price we could find by $15. It features 120mph airspeed and a vacuum mode.