While shopping for some hydrated lime I spotted this 4 pack of 4.0Ah Ryobi 18V ONE+ batteries instore for a good price. Considering an individual 4.0Ah battery combo costs $139 this is a really good deal for 4 batteries at $249 and everyone should already have a heap of battery chargers from all the Ryobi deals.
This is a limited time promotional item so chances are there won't be anymore stock for quite a while once sold out.