Hi Jenna-Lee,
Yes you can get any capsule tray that fits your capsules. Often the capsule size used is 00 (which fits about 0.5 g of herb). The most common brand that I have seen (and use myself) is ‘Cap M Quik’ You can often find them at local health food stores and very readily online. There are many brands of capsule maker/trays and they are all fine as long as they are the correct size.
Happy capsule making!
Benna