Someone else may know different but from what I know like on Fords, when you need the Din tools you pretty much need those tools. They release the clips holding the radio in which are at the back. You could try using coat hanger wire and cutting it to look like in the picture.
Good luck... tho for $10 you may just want to buy them through that web site.
With your camry there is no DIN tools need all you have to do is take out the dash around the factory cd player and unscrew the brackets on the sides then you just attach your new one to the factory brackets and its all set