If you are in the USA (or Canada) and use the BLF discount code on IMR batteries (15% off purchase) , the GA button top is $5.53 and the flat top is $5.10.
The code is BLF15 (No spacing and case sensitive)
The website is https://www.imrbatteries.com/batteries/…… and the code is good site wide for anything they have.
If interested in the thread I started on this it is HERE