There is one reasonably priced option for international small parcels with tracking. It's the US Postal Service $11 Priority Mail® Flat Rate Envelope*. You get there from the postage rate calculator by selecting Letter rather than Parcel. They're 11.5 x 9.5 inches, fairly decent stiff cardstock, and rated to four pounds weight. According to the pop-up that appears when you hit the question mark, they include "Tracking to major destinations". I've used these to receive computer parts from the US many many times. There's no requirement that the contents have to actually be a letter or documents. Occasionally I've asked the shipper to wrap some clear tape around the envelope to reinforce likely tear points. Speaking of which, what are the dimensions of the displays? I downloaded the datasheet PDF, but all I got was 16 blank pages. I'd like as many bubblewrapped displays as you can stuff into the above envelope ;D * URL is for a 3 pound letter to Australia