Solarcoin price is currently very very cheap, particularly when you consider the huge potential of this project. Seems a good investment. I expect SLR to reach close to $20 each one day. A coin's value is based on number of users (for the most part). Currently there are only a few thousand users of SLR, but with the recent SMA partnership, new/improved website, and nearing a wallet upgrade, I think the number of claimants/users will begin to increase quite a lot.