I hear ya. The next fish I want is a flame angel. $60 locally. But, if I wasn't able to save up for that, I might choose a coral beauty angel for $24 at the same store.
Damsels, chromis, some gobies, can often be found for under $10. Add slowly, one fish at a time. It's an expensive hobby, but it's a slow one, too.
Another thing to consider is that even at $3 each for Bala sharks, you'll be replacing them every few weeks, even if acclimated slowly. They are purely freshwater fish, and marine conditions will kill them.
Someone stop me! Please! But... not just yet...
55 Gal Tropical FW
55 Gal Mixed Reef