Recently, the door to my HP 527 broke apart. I could not find a replacement, no matter how hard I tried. Finally, I stumbled on an HP 527 on eBay for sale for under $9.00. The description said the lens was broken and it should be considered for spare parts only. After I confirmed that the battery door was intact, I bought it. It was shipped to me in about three days via standard US mail. I opened it, removed the battery door and installed it on my camera … good as new. Your HP 730 series camera could be on eBay too … I suggest you give it a try. Elston