Post-Baccalaureate Online BS Programs?
There are many online programs from traditional universities that you could choose from. A significant question is your aim for the degree. 


Will you pursue further education?
Are you planning to switch careers?
Do you intend a career in industry or academia?


It's important to understand what your goals are. Particularly in the software industry, if your goal is hobbyist, to build skills that will supplement your current job or to pick up as a developer, the education you already have may likely be enough. (Edit: And, if undergrad is your terminal goal, this probably isn't the forum.)

If the goal is to pursue graduate/advanced education or research, then the specific degree is obviously valuable. A problem may exist with finding the nexus between "good" and "easy to get into" (you indicate a concern with admissions rigor at UI and UM-UC). Plus, it's important in those cases to be developing relationships with faculty, a task that is hard to do through emails and online forums. 

Programs through traditional universities have costs similar to their in-person programs. That's going to be hard to get around. 

One exception that comes to mind is Harvard Extension School's programs. They offer a computer science focus, but do require at least 16 credits completed through in-person courses in Cambridge. 

I unfortunately can't offer a comprehensive list of online bachelors degrees through traditional universities. 

Something else to consider, though, is instead of pursuing a second bachelors, look for masters programs that function as career-change degrees. These will have a lower bar for entry and include some fundamental learning (though generally expect you to learn quicker). 


Open University (Bachelors, Post-bachelors, Masters)
Oregon State (Bachelors CS)
Drexel (Bachelors Info Sys completion, Masters CS)
Harvard Extension School (Bachelors CS, Masters Software Eng)
Georgia Tech (Masters Computer Science)
Penn State's World Campus (Masters Software Engineering)


come immediately to mind as being accredited schools with these sorts of online programs. They're all easily found with a bit of Googling, however, and I'd suggest doing a little focused searching to see what you can turn up. 

Many, many schools have programs today. Masters programs will probably be cheaper than Bachelors programs. Through a traditional school, though, all are going to cost. And ultimately, unless you're looking to get deep into theory, you're likely better off completing your Associates, learning a few modern languages and learning through application.