Things eBay needs

For all the awesome things eBay sells, oddly, there are still things I can't find satisfactorily.

• Bubble tea straws - these are strangely overpriced. Why aren't there any HK shops selling these?
• Replacement aluminium filters for cooker hoods - only very few models are available. Why don't they sell DIY filters?
• Lenticular sheet - used to make 3D pictures or moving pictures. This is hard to do yourself without software, but you'd still expect eBay to have it.
• Acrylic sheet