In the same boat here, actually. The schools I'm applying to, for the most part, don't require O-chem. There is one school that im thinking about that does, but at this stage of the game, I'm wondering whether it's worth it to spend the money and take away time from work for a class I may not even need.
I don't know that you're gonna find anything online for under $1000, to be honest. UNE and Oregon State both seem to be good options, but like you said, expensive. Is an in-person class, perhaps in the evening, an option for you? It may not be very convenient, but if you can make it work for just a few months, you'll save some $$$. Plus, organic chemistry seems like one of those classes that is always better taught in person if you have that option.