I found this "Ultra Regeneration Serum" via Amazon. It costs $83.99 per bottle and claims to contain "Commiphora Gileadensis Bud Extract- (Balm of Gilead)." However, its description mentions "Balm of Gilead from the balsam poplar tree," and the balsam poplar tree is Populus balsamifera, which is a North American species and distinct from the Middle Eastern Commiphora gileadensis.
So, it'd probably be worth verifying that there is actual C. giledensis content, as I suspect that a similar extract from a different species wouldn't qualify Halachically. You could contact the person behind it, Ettia Tal, an Israeli holistic healer presently in New York. I expect that she'd be able to verify the exact contents of her product, and she may even be willing to help you source the raw ingredient you want.
A wholesaler of raw materials for cosmetics and the like called Active Organics lists "Balm Gilead" for sale in their line of "Actiphytes." The information sheet for this product specifies that it is "Commiphora Gileadensis (Balm of Gilead) Extract and lists the Latin name "Commiphora gileadnesis." However, under "Other common names," it also lists "Populus candicans," a synonym for the North American species mentioned above. So, again, it's probably worth verifying the actual species.
This company doesn't seem to list prices online, but it does specify that the minimum order for these ingredients is 4 kilos, which is probably way more than you need. They do mention the possibility of obtaining a sample (presumably primarily for companies that are considering a wholesale purchase), so it may be worthwhile contacting one of their sales representatives to see if they'll provide a tiny sample for personal religious use.
