Can I travel into the UK from South Africa one way on a spousal visa?

My husband is a British citizen and lives in England, I am traveling to join him but want to know if I have to purchase a return ticket? Its a waste of money. Thank you

Yes

If your husband has applied for a spousal visa for you and it has been approved, then the answer to your question is...
No you do not need to purchase a return ticket, as having a British spousal visa means that you plan to join your husband in the UK to live and work. Why would you need a return ticket? The UK is going to be your home.
Good luck to you!

i heard it's okay,but how can i get a Visa to UK.i really want to go there to live and to study.

if you have already received your visa as spouse to enter the UK? then,yes you may purchase a one way ticket.