u/ICouldntFindAUsernam

I can't for the life of me keep more than $100 in my savings, I just want to have like $3000 min. in my savings for emergencies but I keep pulling money out for stupid impulse buys, do you guys have like savings accounts that don't let your withdraw or is it just a matter of restraint and discipline? I was thinking about doing a cd but you have to already have the money and it doesn't look viable to serve as an rainy day fund.