I had built a new computer last may or so, and got all my rebates, finally. Got the last one a week before christmas. Been so long I had forgotten about it and it was for a case I had bought. And yeah a lot of paperwork and number writing.
So next time I build a computer, I dont think I will include the rebate price reduction in my figures, as it may take 6-8 months for some of the rebates to clear. And by gollies

with my memory if a company waits long enough and they "forget" to send rebates, I'm SOL.