…Found some batteries. I’m in the U.S., so that’s my shipping destination.
Banggood has 4-pack of Samsung 35E protected button-tops for $17.99 through August 20. Shipping to the U.S. is $5.37, which gives a total price of $5.84 per cell if you uncheck shipping insurance during checkout.
This price is actually similar to, or slightly higher than, some of the coupon deals available through the usual suspects on this forum, so don’t fret if you don’t order by Aug. 20. There are existing codes for the 4-pack listed above and they should be active again after the current discount expires. You never know with Banggood, though.
I haven’t found anything better unless you buy from Aliya’s or Lucky’s on AliExpress and shipping can substantial for li-ions from those stores as well. AX is a risky place to buy li-ions, but these two sellers have been reported to ship legitimate cells in the recent past. Not sure if this remains true, but their feedback is still okay.
Aliya’s has a 4-pack of LG MJ1 3500mAh’s for $15.49 plus $3.16 shipping to the U.S. They are flat tops, though, and would require solder blobs to work in the LT1.
Also at Aliya’s, there’s a 4-pack of Sanyo GA 3500mAh’s for $20.20 plus $3.16 shipping to the U.S. These are button tops.
I’d rather buy from a U.S. seller, but everything I’ve found so far is at least $30 for 4 cells and shipping.