I found some really cheap tile that I can tile the garage floor with, thinking that I will also add a little glue on each tile to keep them more in place. Do you think it will last (not forever)? Or is the garage too much weather for those stick on vinyl tiles. I can do 420 square feet for 30.00, so I'm hoping it will work.

You pretty much answered your own question - really cheap tile will not stay if you mean the peel and stick tile. Even really good peel and stick won't stay because moisture gets underneath. Paint the garage floor. Home improvement stores or paint stores sell a garage floor paint that you paint on and sprinkle these dots of color over the paint. Looks great and is durable. Not as cheap but a better result.

I agree, the tiles will be short lived. Even with a good adhesive primer which is needed when you use peel and press.