I mean a 10 mega ohm resistor. That and the capacitor are just for measuring the battery voltage which is above 3.3v. You could use 10k ohm resistors but it will drain the battery faster. It's all described in this article:
https://jeelabs.org/2013/05/16/measuring-the-battery-without-draining-it/
Two stores that I tend to buy things like resistors, capacitors, headers, etc. at are dipmicro and tayda.
Giving that shipping for Tayda was $4.75 (for US delivery) the last time I ordered, and a 10M resistor is $0.01 to $010, you may want to see what other components these stores stock that you might need to save on shipping (Tayda, may have a $10 minimum order).
In my last shipment from Tayda, I ordered it on Tuesday November 7th, it was put in the mail on Thursday November 9th, and I received it on Monday November 13th. Shipping was $4.75.
I haven't ordered from dipmicro in two years. I bought a giant bag of various resistors, and I still have most of them (I do use 2.2K resistors for Teensy i2c setup, and occasionally I will use 10 ohm, 330 ohm, etc. resistors). In Dipmicro, resistors are listed under '
passive components'.
Dipmicro is a Canadian company, in Niagara Falls, and they have somebody cross to the USA side of the falls 3 times a week to mail US stuff from a US post office. Because I live in New England (near Niagara Falls), stuff generally got to me in a few days.
I have a complicated setup in that my credit/debit cards are listed with my PO box as my official address (when I moved into the house, we didn't get mail delivery due to living on a private road and I had to use a PO box -- we get mail delivery now to a row of boxes by the side of the road, but I keep the PO box because the delivery people seem to leave neighbor's goods at random houses, and I don't trust package delivery to get the right house). IIRC, when I last ordered from dipmicro, I could only send it to the PO box and not use my work address.