I had the same experience about the rubber on the rear wiper was tearing off after about a year. I did buy a replacement oem wiper off ebay for around 10. However I am actually questioning the quality of the oem wiper. I had a mazda3 hatchback before and I never replace the wiper during the 3+ yrs of owning it.

 

Seeing that the old link from the original poster says that the wiper is no longer available by that seller, I found this link, where you can purchase the rear wiper for $ 3.70 + $3.11 for shipping, which is even a better deal. Still a great deal. I needed one right away, and purchased one from the Hyundai dealer, and they charged me $20.00 installed. 07~12 HYUNDAI ELANTRA TOURING I30 REAR WIPER BLADE GENUINE PARTS OEM 988501H000 | eBay

 

Well, They are down to $4.99 on Ebay and free shipping