You can lose the whole "ebay scares me" thing by ditching boost and going with a GSM based MVNO provider. There are tons of good ones out there just as cheap as boost and better networks. You can virtually choose any unlocked phone under the sun and it WILL work with the provider.
Some good ones...
Boost stinks tbh.
Look at the pickle you're in right now for example. You can go on Amazon and get a Moto G for $100, slide...