Sony only sells the A300 in certain bundles that include the 18-70mm kit lens.
They do have a $100 instant rebate sale on some of their bundles now with the Accessory kit ($100 value that includes a case and spare battery). So, you can pick one up at roughly the same price as the kit without the accessory kit.
I'd probably go that route, then buy a different lens separately if you don't want to use the 18-70mm. It doesn't add enough to the cost of a kit to worry about it, given the bundles they have right now.
Here's an example from a reputable dealer for that bundle (it's actually slightly less than the standard kit with the A300 and 18-70mm lens alone, and you get the body, lens, a case, and a spare battery with this option).
http://www.bhphotovideo.com/c/produc...R_Digtial.html