Do you know if there's a similar eBay listing for GBA SP shells?
Yes I ordered a gold one last month and installed it. The color wasn't the same as I'm the picture on ebay so they are giving me a partial refund.
Just search "gba sp shell" in ebay and sort by lowest price. So many options!
http://m.ebay.ca/itm/I-Gold-Full-Ho...P-Gameboy-Advance-SP-/291576693799?nav=SEARCH
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I do understand that are plenty of tutorials, but I'm kind of scared about disassembling it myself because I'm worried I'd break it.
Do you (or anybody else here) have any experience with disassembling these things? Assuming I have no prior experience, would replacing the shell be a dumb idea?
I have disassembled a DS Lite about 30 times now, it seems daunting at first but eventually it becomes really easy and familiar. One of the hardest parts for me is getting the wireless card wire behind the ds cartridge when re-attaching everything as there's like no room behind that thing. Also make sure the volume and power switches are lined up perfectly when placing the backing on. And for GOODNESS SAKE don't lose the pins and springs for the L and R buttons. They take a lot of patience when putting the shell back together, as you will just about have it closed and one of them will likely "spring" free. Buy a broken one and dissect it before taking your good ds apart maybe.