i guess the best satellites in partypoker(often with huge overlays), mtt 0.55-5 so much as well, however in 888 there are many freerolls and some microstakes too.
I always play micro tournaments at pokerstars and I have a good amount of tournaments with micro entries and I also have good satellites, 888 also has good satellites, but in 888 I usually play some freeroll tournaments.
Poker room with wide range of micro limits and others is poker stars. If you check the lobby of interesting tournaments below in the eft corner you can find all relative satellites to the main tourney. 888 Poker room also not bad for micro but honestly I just play only freerolls sometimes over there and did not play for money a long time.