Meritline offers the Merax Brother TN450 Compatible High-Yield Toner Cartridge 2-Pack for $33.95. Coupon code "MLCD15ZN" cuts it to $21.95. With free shipping, that's $10.98/cartridge, a buck under our July mention, and the lowest price we've seen. (It's also the lowest total price we could find by $1.)
A close price: E-auctions-express via eBay offers these cartridges for $22.95, also with free shipping.