I have Fusion batteries that were $49.00 and get me plenty of runtime and voltage for 10x2 in 4wd modified racing 5 minutes!
That's with trick battery bars, already assembled, even with a deans connector or Tamiya if you prefer?....$49.00 and up.
Even buying loose cells and giving up battery life(not charge time or runtime matched) and performance(not voltage matched).....A non matched battery will always have cells which are only partially charged and some overcharged. The main priority of a matched pack is battery life, the top end matched cells give life and performance above average as well.
They also come in plastic reuseable trays that hold up alot better then cardboard boxes do. Seems like a pretty good deal to me?..........Jim