Another Deal Site via Amazon offers the Canon Speedlite 90EX Flash, model no. 6825B002, for $41.42 with free shipping. That's pennies under our mention from two weeks ago and the lowest total price we've seen. (Outside of other Amazon sellers, it's also a current price low by $18.) This shoe mount flash is compatible with all Canon EOS cameras and features a guide number of 30-foot and provides coverage for lenses as wide as 24mm.
Note that this product comes supplied in a plain white box, instead of the manufacturer's packaging. It includes all the manufacturer's accessories.