Currently at Walgreens the Glade Expressions Starter Kits are on sale Buy One Get One Free.
Combine that sale with a coupon to snag a VERY good price:
Buy (2) Glade Expressions Starter Kit $4.49 each
Buy one, get one free
Use (2) $1.00 off Glade Expressions Fragrance Mist Kit 
Final Price: $1.24 each when you buy 2
This sale will run through December 1, 2012.