I just yesterday bought/ordered two Won Brothers "Pro Heat Unbreakable Titanium IC Aquarium Heaters (w/ Remote), Size: 300 Watts", from ForYourFish.com.
They were only $22.99 each and S/H was $7.95.
I researched these and other "Titanium" heaters and found this brand to IMO
have the best reputation.
There was one online retailer who had them for less money, but I did not like their sales agreement, "All sales FINAL", so i took my business elsewhere