Both vents together would be about $20. i really like these charms. I love the color, they match with so many outfits due to their neutral tone. Tall enough to fit booties (roughly w/ 3 ft heel), which was my main concern and fits well over the 12-15 pairs it advertises! The sole has patterned groves that Im sure would provide a solid grip too. Not worth $29 at all With this fabric rack, you?re putting MOST of the pressure/load ON THE RACK first, and then you simply tie it down to your car?s roof. My boys LOVE these shoes especially in the summer. The sole is flexible rubber, so they are OK to step out on the patio if I need to, and they will not get soiled from coming in contact with the floor or carpet in my house or patio. -Son amortiguados eso ayuda a la comodidad.