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What sites do you suggest going to to "Buy" domain names, as oppesed to leasing them for 1 to 10 years.

There aren't any. You can only register domain names for a period of time, and must renew them when the registration expires. This is the case for all domain names. As long as the registration is renewed, you own it. Once you let the registration expire, it's up for grabs.
Network solutions will offer it register it for 100 years. It is really just a way that they auto renew it every 10 years. Other registrars like godaddy.com will do the same thing, but they don't call it a 100 year registration. The simply renew it automatically for you, if you want to keep it forever.