Well for that price your not going to find anything reliable or efficient if you plan on running a full scale file hosting company. If your just looking for image hosting or small 1-10mb hosting, then you might be okay.
If I was you and only had $30 I would focus on the landing site, get a couple Economy packages from (check PM). Hopefully they don't put you on a server that has most of it's space maxed out. You should be able to balance the majority of your users files without issue in the beginning.
Please note that the upload speeds could be horrendous in some instances. It all depends on what kind of server they put you on and how bad it's getting abused.