Vanguard isn’t allowing me to buy bitcoin ETFs……where can I buy them?

Hello,

So I currently have a brokerage and Roth IRA account with vanguard. I'd like to purchase bitcoin ETFs (IBIT, BITX, etc) but Vanguard for whatever reason doesn't allow this. Where can I buy bitcoin ETFs? Also, is there any brokerage where I could buy these and put them in my Roth IRA? As of now ive only been buying bitcoin directly via cashapp. Also, how long would it take? Id like to buy them before the halfing event that is coming up. Any advice would be greatly appreciated.

Thanks again.