I have to confess I'm not really on board with plasticky air fresheners, which are not very environmentally friendly. But if you simply MUST have some smelly Jello bits in a glass bowl in your home, at least get them for free with this mail-in rebate offer.
"Try For Free! Renuzit Crystal Elements Air Freshening Crystals (Up to $2.99 on the 9 oz refill and Up to $5.60 on 18 oz refill). Purchase at your favorite retailer between 11/14/11 and 2/28/12 and postmark your rebate form by March 31, 2012."
Download the form and prepare to surround yourself with fragranced crystal chunks.