Mike, Michelle is probably very accurate in the belief that program availability is limited at this point. To that end, 'advertising' seems to be the key to a wider variety of giveaway programs.
Everywhere I go on the net, whether military forums, new software developers' forums or extended family members, I give folks a heads up on the Giveaway of the Day site, believing the exposure and participation will increase the likelihood of companies' willing donations to Slava and this site.
Although I discovered Giveaway of the Day only recently, I've 'advertised' it to hundreds of people, directly, and who-knows-how-many indirectly. There is also a link to Giveaway on several pages of my website, which is certified child-safe.
I do agree that it would be nice to have more variation, but I think that will come in time, as the site grows in popularity. Any suggestions on how to promote the site and increase Slava's choices of giveaways? I've run out of ideas, being down to my last surviving brain cell nowadays, but I'd be willing to try your suggestions or donate any space necessary on my website (such as it is) to help the cause.