You can invest in balanced funds in a taxable account, but it is often not advisable. It makes it difficult to manage taxes for each asset class separately and it may not be the most tax-efficient portfolio in a taxable account. It still might be worth it to save a 1% advisor fee, but maybe not to save a 0.3% advisory fee.
There is the Vanguard Tax-Managed Balanced Fund that might fit the needs of some investors as an all-in-one fund in taxable space.