Still available.
Compared to what people pay here for Bitcoin tokens this offer is a steal - starting from just 0.00075 per coin!
That's debatable. There's a guaranteed market for Casascius coins in this forum, among this crowd.
You're not guaranteeing anything of value. You guarantee a quantity of coins from different countries - neither of those factors indicate there is numismatic value to be gained. What's the guaranteed face value of these batches of coins? Give us that, at least.
About what kind of guarantee are you talking here? It's basically collectors being interested in buying Casascius tokens. Nobody can guarantee that the high amount of interest in physical Bitcoins will be equally present in the future. Especially considering the vast number of new Bitcoin tokens issued by non-official "mints". If you ask me - with few exceptions - the prices paid for these tokens are way over the top and will see a correction in future, because these are only produced to be sold to collectors and see no real world use which is a significant factor for lasting value (i.e. the smaller the number of people that encounter a specific item in real world the more likely an associated collecting trend will slow down, because no new demand is generated - it just depends on the interest of very few people).
So physical Bitcoin tokens in no way offer any better guarantee for lasting collector's value than the coins I'm offering here. In fact - outside of this forum - the community with an interest in real coins is much larger.
For collecting coins, the face value is basically meaningless. In fact the most valuable coins are quite old and their face value can no longer be redeemed. Would you say that a Casascius token is sold just for the loaded Bitcoin value? No! There are even empty coins that are sold for significant amounts and there are other DIY Bitcoin tokens which are sold without any Bitcoin loaded.
This alone already shows that collecting is not done with the motive of a value gain. It is done for enjoyment and has an aesthetical and social dimension.
For the price you're paying here you get more than 10 times the number of real collector's coins than you would pay for a typical Bitcoin token. I'm selling here for much less than I could, because the sheer number of coins would require too much work to put in each coin separately.