This is the resources I've used, having now leveled two alchemists.
Most of the recipes were Orange, but turned Yellow while using them.
One recipe was Green, for three skill points; took 4 and 18 combines.

I'd rather AH purchase everything, and use Dailies to fund it.
But if you want to farm something, or there isn't anything on the AH for a segment.

Also, using: http://www.wowguideonline.com/wow-pr...ing-guide.html
I've been told it has a lot of ads on it, but with Firefox/NoScript, I don't see any.

060 x Peacebloom......... Elwynn Forest or The Barrens
060 x Silverleaf............ Elwynn Forest or The Barrens
030 x Briarthorn........... Darkshore or The Barrens
015 x Mageroyal........... Darkshore or The Barrens
040 x Stranglekelp........ Wetlands or The Barrens
030 x Liferoot.............. Swamp of Sorrows
030 x Kingsblood......... Stranglethorn Vale
045 x Goldthorn........... Stranglethorn Vale
005 x Wild Steelbloom... Stranglethorn Vale
070 x Sungrass............. The Hinterlands
015 x Khadgar's Whisker Stranglethorn Vale
004 x Iron Bar .............. Mining in The Badlands
001 x Black Vitriol.......... Mining in The Badlands
004 x Purple Lotus.......... Tanaris
004 x Firebloom............. Tanaris
019 x Arthas' Tears......... Western Plaguelands
040 x Blindweed............. Zangarmarsh
055 x Golden Sansam...... Zangarmarsh
015 x Mountain Silversage Hellfire Peninsula
040 x Felweed................. Terrokar Forest
055 x Dreaming Glory....... Terrokar Forest
020 x Ragveil.................. Zangarmarsh
020 x Netherbloom........... Netherstorm
015 x Talandra's Rose....... Zul'Drak
050 x Goldclover.............. Howling Fjord
060 x Tiger Lily................ Sholazar Basin
005 x Pygmy Suckerfish.... Fishing in Borean Tundra
010 x Adder's Tongue....... Sholazar Basin
010 x Icethorn................. The Storm Peaks
165 x Lichbloom............... The Storm Peaks
010 x Dark Jade............... Mining Saronite/Titanium in Icecrown
010 x Huge Citrine............ Mining Saronite/Titanium in Icecrown
010 x Eternal Fire.............. Wintergrasp when your faction controls it or Seething Revenant
045 x Fire Leaf.................. Borean Tundra
015 x Frost Lotus............... 6.5% chance at any node