Well there is lavender and purple albinos as well as white albinos. Purples tend to cost a little more. I don't know who you are buying from but $1500 for a SD/D purple is pretty high. And is it 100% het anery? That would make it 100% het snow. That would cost more. Caesar is SD/D White albino Tiger 50% het snow which means 50% het anery as visual albinos are going to obviously be 100% het for albino lol. Anyways, I got him from Kris over at Vital Exotics and he was $750 but Kris sold him to me for $500.
And I agree, super dwarfs are more expensive. Dwarf is a little more but not a whole lot from what I've seen. And of course the more genes in it the more expensive. An albino is going to be cheaper than an albino tiger which is going to be cheaper than an albino suntiger.
Most SD/D I've been seeing are under $1000. Check with Daniel Solis or Kris at Vital Exotics and Erik Alvarado. He has a 2016 50% anery motley tiger right now for $1500 which is pretty nice. I'm not really a huge fan of motley though. He also has a platinum motley tiger 50% anery for $550 which I really like. I love platinum tigers and the motley there looks good. But for $1500, you should definitely be getting a 3 gene animal.
Oh and forgot, if you got the cash, Daniel Solis has an ultra ivory SD/D for sale now for $550 that might be suntiger het anery. If I had the caging, I would hop on that like a fat kid on a snickers. I'm kind of junky for light colored snakes haha.