Available now? To whom? People like Woz, sure, they'll be delivering his shortly because it buys good PR. Regular people, not so much. So far Bolt is shipping only in CA and OR, in limited quantities and only if you reserved a while back. Of course, Model 3 is not available either, so as of right now, except for very few people, neither is available. However, I bet there are more Model 3 reservation holders that decided and actually took possession of a used Model S or even a new one, than there are people who took delivery of a Bolt.
Also, as far as range of Bolt vs. Tesla, read Woz'es comments on the subject, and he really is trying to love the Bolt. Unfortunately Bolt is missing a charging infrastructure (and charging speed) which is the main reason why Woz is keeping his Model S (or two). For most people trying to decide on Bolt vs. Model 3, keeping two cars, one Tesla for trips and one Bolt for around town is not really an option - they need one car that can do both. Hopefully GM and others will build out their own charging infrastructure soon to compete with Tesla - competition is great for consumers.