EDIT : On break due to natural disaster, will update later if stuff becomes available again.
As of 30th of april 2013 I have available :
Water : - 40 mercury
- 45.5 or so salt
- 37 lead
Lime : - 36-40 lead (if luck I can forage a 40 lead one every day or so, 37 is more common)
Granite : 35-40 mercury
32-37 lead
Humus to kickstart your first generation of saplings : 32 lead
Could use : any water higher than 42 lead
lime higher than or equal to 40 lead
granite higher or equal to 40 lead
If my post shows as "last editted" more than 2 weeks prior to your reading the post itself, assume I've stopped looking for that variety of stuff, but feel free to contact either way, can't hurt to ask

Exactly 6.022 x 10^23 worth of Lach molecules.