Do some pricing. Our local instructor sometimes does workshops that cover a lot of material for a relatively low price.
Then there are dances she does, where the lesson is 30 minutes and then every one enjoys dancing for a couple of hours--this is also relatively inexpensive.

But a basic class and LOTS of practicing at home is the best bet for progress.

Although hubby and I splurged on a private lesson and that was wonderfully productive!

Also, sometimes there are clubs, just groups of people who like to get together and dance--and maybe you might find friends there and discover someone who is willing to teach you whatever little they know--it may be a good way to learn wrong--but even wrong it can be fun.

But I think the group lessons I have taken were worth the cost, expensive though it was!