I've tweaked the Long Arm of the Hutt adventure a bit, and would like to know what you guys suggest 1 dose and 100 dose (cargo container) of Ryll be worth?

I would say that it is cheaper than Glitterstim, which is cut with Ryll. It's likely more expensive than Booster Blue or Avabush since Ryll also can be used for Medicinal purposes.

I would say 50cr for 1, 4000cr for 100. That's just ball parking it.

Does LAotH say anything about the effects of using Ryll?

From WEG:

A legal spice mined on Ryloth used for medical pain relief. Legal on Ryloth, but restricted in the Empire. It can be sold with a permit.

Illegal use as an intoxicant and hallucinogen.

Twi'lek Starport Master Koh'shak sells to smugglers a case for 5,000 to 10,000 credits. Off world it goes for 10,000 to 25,000 credits.