You're not necessarily without hope. I'm up to three or so squads of 90's era Chaos Renegades and a dozen or two or three of the Realm of Chaos era daemonettes, so you CAN get the models you want. The Diaz daemonettes when they came out were $4/each (I think, it's been a while since I dug through the archived versions of the store), and I have seen lots go for as little as $6 per model.
But, if you don't want to exercise patience and your wallet, then you are going to have problems.
Fight for freedom against the undead Emporer!