Probably a little hard to convert the platinum to gold straight up. Also, it'd be ok for large purchases but I wouldn't suggest dropping a platinum for your 5cp cup of ale to get change.
There is a potion seller who sometimes operates out of the Slumbering Drake. He's not from Cillimar but, oh what's this, he happens to at the Slumbering Drake your night in town. His cleric based potions are a little pricier than normal but he does have some.
Here's his inventory the night you're in town (it may be different in the future) oh, and his name is Quintus.
POTION PRICE # NOTES
Cure light wounds 75 gp 3 Caster level: 3
Cure moderate wounds 450 gp 2 Caster level: 5
Magic weapon 50 gp 5 oil
Jump 50 gp 6
Delay poison 400 gp 1
Blur 300 gp 2
Mage armor 50 gp 4
Barkskin 800 gp 1 +3
Invisibility 300 gp 4
Keen edge 750 gp 2 oil
Water breathing 750 gp 2
Resist energy (fire) 700 gp 2 20 hp of fire damage
Bull’s strength 300 gp 2
This message was last edited by the GM at 04:21, Tue 22 June 2010.