Louby, both Sabelpoots and Serama are true bantams, so their eggs are very small.
My poots lay on average a 30g egg which is very large in proportion to their body size. I believe serama eggs can be even smaller, in the region of 20-25g. Most people keep serama and poots for their prettiness and for show rather than for egg production.
One other thing to keep in mind... Sabelpoots should really have something soft to walk on. most are best kept under cover all year round to protect their foot feathers. Mine rough it, and are in the main pen with all of my other breeds (including a couple of very large brahmas!) but their foot feathers are rubbed away to almost nothing.
Also, as serama as so small, many breeders actually keep them inside (heated greenhouse or similar) during the winter so that they don't suffer (their low body mass makes it more difficult to cope with very cold temperatures than "normal sized" hens.
Another thing to keep in mind, especially with Serama and Sabelpoots, is to read up on the breed standard. It costs as much to keep well bred birds as it does to keep poor quality birds, so you are better off getting very nice examples. Both Serama and Sabelpoots are increasing in popularity over the past couple of years, and there are more and more people breding like mad to make a profit, but not focusing on quality or standard, and consequently it can be quite difficult to find good examples of both breeds.
I'm not sure where you are, but both the National and Federation shows are looming in the not too distant future. If you pay a visit you will be able to see good examples of the birds, and talk to the breeders