We have a number of different cultivars. Some named, some are my selections from the hundreds of seedlings I grow most years.
You need to remember that any plant grown from seed will have some differences from the parent because all sexual reproduction involves recombinations of genes. That means there is no point in giving you the parent name (if I know it) because your seedlings will not be that variety.
I can select seed from trees with specific traits if anyone wants to try to grow particular features. My experience is that most seedlings are somewhat like the mother tree but there are no guarantees that the seedlings will have any or all of the mother's traits.
I can offer:
Trident maple.
Japanese maple from trees with any of the following traits:
Standard Acer palamtum. Strong and easier to develop as bonsai.
Red leaves. Tend to have larger leaves and longer internodes.
Small leaves and short internodes. This tree looks great for bonsai but has proved very slow growing and less robust than standard JM
Weeping cut leaf JM in either red or green leaf. viability is low and survival is very poor in most cases. See some of the threads discussing this before deciding to try these.
Upright cut leaf JM. Seedlings from this one are highly variable. Most tend to have smallish leaves and are fast growing but very few have shown the deeply cut leaves of the parent tree.
If you can't make up your mind or just want to try a wild lucky dip mix I am happy to put a few of each in.
Packets of around 20 seeds $2, 50 seeds $3 and around 100 seeds $5
Add $3 for pack and post on each order up to 3 packs of seed and talk to me about cost for larger orders.
I also have access to seed of other species that may be of interest.
English oak - large seed so 3 seed for $1 and $10 to cover extra post.
I was hoping to offer Willow leaf oak this year but the birds appear to have beaten me to those acorns

Chinese elm - small seeds so prices as for maples. I have not grown these so don't know what the viability is.
Birch. We have silver birch and canoe birch but I can't tell them apart so seed will just be birch. Small seed but seems to be viable because I get hundreds of seedling in my pots every summer

There's probably more I can obtain if you have any special requests but don't bother asking for pine seed as I get first crack at the few I've harvested this year.
email orders to neil@shibuibonsai.com.au or just PM Shibui through the Ausbonsai messaging.