I don't know where you are related to downtown Boston, but the first O'reilly I checked in Everett shows 5qt Mobil 1 EP 5w-20 as in stock for $38.99.
Given your use case of not many miles and not severe duty, I'd get a jug of that and be done until next year. The one quart of 5w30 in the mix for that little use isn't going to matter.
I also wouldn't worry too much about finishing with what you have on hand and, at most, plan on changing the oil a little earlier next time.
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OH NOES!!!!!1 MY CAR HAS T3H UND3R5T33R5555!!!!!!1oneone!!!!11
Team WTF?!
What are you gonna do?
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