I've watched some teams in the past practice with a ball that seemed almost like a hacky sack. You hit it and it didn't go more than 20'. Any idea what these were and where I can find some? Thanks in advance!!

TCB (Total Control Ball). Easy search on the internet will show you several options to purchase.

We used the TCBs a lot before games where there was limited space and time for some BP before games. It makes BP go a lot quicker and less energy is used shagging. They are heavier and some people just don't like hitting them because of the "feel". Another option is the SKLZ Limited Flight practice softball. They are basically a larger wiffle ball made with more flexible material. Here is the link where you can find those https://www.amazon.com/SKLZ-Limited-Flight-Practice-Baseball-Softball/dp/B00N0NGU7G/ref=asc_df_B015CK4JAO/?tag=&linkCode=df0&hvadid=312053899906&hvpos=1o4&hvnetw=g&hvrand=17372819702150975324&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9022906&hvtargid=pla-383917371508&ref=&adgrpid=62421705992&th=1