I think that, in addition to earning streak savers in-game, we should also have the option to purchase them with quest points. Since the monthly costume costs 500 QP and a costume gift costs 1,500 QP, it would make sense for streak savers to be priced around 2,000 QP, given how valuable they are!
This would be cool; at the moment I kind of need to make sure I reach 100 days before a big vacation which is kind of annoying. I think 2k is good. Voted.