Hi Taylor, we'll need to send you replacement spokes, as you'll have difficulties finding this size in a bike shop. They're much shorter compared to the common sizes used on a conventional bicycle. Please drop a line to our support team and they'll assist you.
As to the sealant, we use NRG bike green sealant. It's an industrial grade sealant manufactures in Italy by stacplastic.com. The sealant is actually really good, but finding it in stores would be difficult :( This is why we offer it in our online shop.