Discus aren't quite as fussy as they're made out, and as long as you keep on top of water quality, give them space, give them a good, meaty food and maintain a slightly lower pH (mine used to sit dead on 6.5 just with my driftwood) there's no reason you'd have any issues. As you've seen they can get pricey, though, often dependent on the variety. I'd consider that $45 (about £30 over here) expensive, but then again I haven't bought discus in years so I don't know what I'd expect to pay now.