There is no loose cells at Radio shack.
You can look at an electronic surplus store, or go in any hobbyshop around you. They carry them.
Most high level Li-Po packs don't have any limiter pre-built. This is because the cut-off usually only allow 10A to flow, so you lose all the power you gained from high quality, high rate packs.
If you are not very well equiped, stay clear of Li-Po. I use some, but the maintenance and care you must observe is extreme. Not for general public.
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