Just to be crystal clear, and because I like making lists, here is the total count of all non-blank cards in each expansion.
Base Set: 486 cards
Intrigue: 492 cards
Seaside: 288 cards
Alchemy: 150 cards
Prosperity: 299 cards
Cornucopia: 150 cards
Hinterlands: 292 cards
Dark Ages: <= 500 cards
Presuming Dark Ages has at least 490 cards (if not, they could have included an additional Kingdom card), the total number of sleeves needed is between 2647 and 2657. If you only need to sleeve one set of the basic cards, you only need between 2438 and 2448 sleeves.
... Where the hell did you get your card count???
EDIT: Nvm. I figured it out. Why in God's name would you sleeve Randomizer cards? It's not like they'll be seeing any plan or usage at ALL. Esp if you have a nice Randominion app like I do, lol. (By DougZ of beloved isotropic fame).
https://boardgamegeek.com/wiki/page/Dominion_series^ Use that. That has the correct count. I just confirmed it.
Below is Sleeving summary of the card count (excluding non-sleevables*):
Base Cards up to 4 players (30G,40S,60C,30C) 160
Base Cards up to 6 ppl** (30G,40S,60C,20C) 150
2nd game** (10C) 10
Dominion (1st Edition) Kingdom*** 252
Intrigue (1st Editino) Kingdom*** 258
Seaside Kingdom 262
Alchemy Kingdom+potion 138
Prosperity Kingdom+colony 274
Cornucopia Kingdom 137
Hintherlands Kingdom 266
Dark Ages Kingdom,Spoils,Ruins,Shelters 465
Guilds Kingdom 130
Adventures Kingdom 364
Empires Kingdom 276
Grand Total to sleeve: 3142. (Get 32 100packs or 63 50packs.)
*Cards I've defined as non-sleevables: Randomizer cards, Blank Cards, "Trash" card. If you really want to sleeve the blanks and Ranodmizer cards... look at the above provided website for card breakdown of each expansion.
**For 7+ players, it's just recommended you split it into two games; so if it's just second game, just take "Base Cards up to 6 ppl and combine with 2nd game curses.
***Watch what edition your Expansion is! There's apparently a new 2nd edition Intrigue and 2nd edition Dominion, which could change your sleeve count. Again, look at that website which has all the card counts.
****Unless otherwise specified, all the listed Expansions above are 1st edition. Seeing as they've come out with second editions for Dominion and Intrigue... I dunno if they'll also do something weird like that for the other Expansions.