Here is a source that should get you started, it includes a brief guide to cultivation.

You can certainly put them outside for the summer, but they will need to be protected from rain, or at least from 90% of rain. They absolutely need to be kept dry in winter, and best to keep them frost free also.

One Lithops, two Lithops, a hundred Lithops, oops I need a bigger greenhouse!

I checked out that website, and it seems to be a good place to buy them. The pictures on their website and a few others, though make it seem like lithops are pretty small. I've never seen one in person, so how big are they? Is there a pretty decent sized one that is good for beginners?

There are so many types of lithop compared to most carnivorous plants. What type would you recommend for a beginner that wants a nice looking decent size plant?

Thanks,
Sean Welton

Each Lithops head is one to two inches across, a few species slightly smaller. Seedlings may take three or four years to reach that size. Old plants will often form a clump of multiple heads, but a plant more than 6" across is very unusual.

I like L. lesliei as a good starter plant. Or you might prefer the appearance of L. hookeri, L. aucampiae, or L. pseudotruncatella, all are easy species. If you want white flowers instead of yellow, L. salicola is the most robust.

Plenty of applicable reading to be found right here, this can be your "Bible"

Wow, thanks! Thats lots of information!

Thanks,
Sean

I ordered a variety pot from oldmancactus.com with some of the above species in it. I'll post pictures when I finally get it. :)

you can buy 30 lithops on ebay for a total of 20.50 incl. shipping.

Thats a lot of lithops :) I'm at work now and they have eBay blocked though. I'll check it out when I get home!

After looking around, the watering instructions are kind of confusing at first. How will I know when to water my lithops? I heard that it is when the plants are wrinkled in the morning. Is there a good rule of thumb here?

I can't wait to get them! They ship today! :)

I have also taken advantage of the 30 Lithops for 20.50 deal, i rearely get plants from ebay, but this deal just grabbed me! :)