I have always had one, since I left school. I have done them through St Johns, Red Cross, and a fw other small providers. The St Johns ones are 100% the best, although my recent CPR refresher was excellent. $105 sounds about right. Some smaller providers will do them cheaper/in less time, but are hard to book into as an individual.
May is only 7 weeks away though - if you've lived this long without it, you can probably manage another 7 weeks!