Another Deal Site via Amazon offers the Canon Speedlite 90EX Flash, model no. 6825B002, for $42.60 with free shipping. That's $7 below our March mention and the lowest total price we've seen. (It's a current low of $7.) 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.