I managed to lose the Remote Commander for my A1U while shooing a wedding outdoors. Any ideas about a replacement?

Take a look on Sony's parts website. Looks like one of these will probably do the trick, although there doesn't seem to be a lot of specific info: http://servicesales.sel.sony.com/ecom/accessories/web/categorySearch.do?operation=subCategorySearch&subCategory=11&category=1&subCategoryName=Remote%20Controls&categoryName=Camera/Camcorder

Otherwise, go to Sony's professional parts/service website here: https://servicesplus.us.sony.biz/sony-parts.aspx. You can't link to pages there unfortunately, but enter your model number in the parts finder field (hvra1u) then select accessories. The remote commander is part number 147849541 and costs $22.95. Interesting, it's actually a little cheaper here than the consumer version... I'm surprised because stuff on that site is usually rather expensive!

Thanks for the information! They should ship it with a lanyard or something so it's not so easy to lose.